Use case

Now that Kickback is on Polygon, we can make use of their rich ecosystem by integrating with lending platforms such as Aave.

Feature

• The feature can be enabled/disabled per event
• When a user registers an event and stakes token (eg: $MATIC, $DAI both native currency and ERC20), turn it into aMATIC/aDAI and earn a yield
• When a user withdraws, the yield either goes to A: the participant, B: designated address, C: ower of the event (aka organiser) which is configurable per event.

Notes

• Please provide sufficient test coverages
• Please structure in a generalised way so that we can switch lending providers when applicable

Reference

I have done something similar for Chai (tokenisation of DAI DSR)

• https://medium.com/wearekickback/integrating-chai-into-your-dapp-to-earn-interest-from-dai-savings-rate-ad6d31cf33b5

Prize Bounty

200 DAI

Challenge Description

We are considering to add donation feature. .

To support it, add "sendAndWithdraw(addresses[], values[])" which works like withdraw but it also allows to send to external addresses.

Example

• Given user 0x001 has 3 DAI/ETH(=3000000000000000000) as payout
• When user 0x001 calls sendAndWithdraw([0x002, 0x003], [1DAI/ETH,0.5DAI/ETH])
• Then 0x002 receives 1DAI/ETH, 0x003 receives 0.5 DAI/ETH and 0x001 receives 1.5DAI/ETH (the remaining)

Submission Requirements

• test is required to cover both success and failure cases
• works for both eth and dai
• existing tests are not broken

Submission Deadline

TBD

Judging Criteria

• Good test coverage
• Clean code

Winner Announcement Date

TBD

The use case

• The event ticket can be displayed on the user wallet
• A user can RSVP for friends (The friend still has to sign in on Kickback to receive a notification email and has to have eth to be able to withdraw)
• Even organisers can use Kickback NFT as token gated access on the Discord channel, etc.

Feature

• Each event (Conference) has its own NFT contract
• Contract supports either ERC721 or 1155
• Use Conference.participantsIndex as TokenId
• Metadata uri can be set at Conference constructor
• Metadata uri is set at Deployer and can be changed by groupAdmin. (Refer to changeClearFee for the similar implementation).
• The ticketing NFT cannot be transferred to the address which is already registered (if a user want to buy multiple tickets for friends, the user has to transfer to a different user address before purchasing the second ticket)

Acceptance scenario

Please make sure to write tests to cover at least these scenarios.

• When a user registers, ownerOf(tokenId) returns the registrant address.
• When a user registers, it emits a relevant event that NFT markets like OpenSea use to index.
• When a user transfer's NFT, it emits a relevant event that NFT markets like OpenSea use to index.
• When the registrant transfers the ticket to a recipient, isRegistered/isAttended/isPaid returns the info about the recipient (if this ended up causing too much attack vector, we may make the token not transferrable ).
• When the registrant transfer that ticket to a recipient, the user can register again (as the registrant is no longer registered for the event).
• When a user receives the NFT, the user cannot register as the user is already registered.
• When the registrant transfers the ticket to a recipient, the new recipient can call withdraw and clearAndSend to receive the payout

Prize Bounty

300 DAI

Challenge Description

Currently all participants have to withdraw the commitment they staked manually and this is one of the biggest flows in our overall user experience therefore we now send back to users manually which is quite painful.

The challenge is to add the following function into our smart contract to automate the process.

clearAndSend(num) afterCoolingPeriod which allows anyone to batch send the remaining taking some fees (eg: x % of deposit ).

Example

     Given user 0x001 .. 0x100 has not withdrawn after cooling period
     And payout is 10 DAI and fee is 1 DAI per attendee . (10%)
     When user 0x200 calls clearAndSend(10)
     Then user 0x001 .. 0x010 receives 9 DAI each and 0x200 receives 10 DAI
     When user 0x200 calls clearAndSend(20)
     Then user 0x011 .. 0x030 receives 9 DAI each and 0x200 receives 20 DAI
     When user 0x200 calls clearAndSend()
     Then user 0x031 .. 0x100 receives 9 DAI each and 0x200 receives 70 DAI

Submission Requirements

• Must have both success and failure test cases.
• Must work on both eth and erc20/dai.
• Existing tests are not broken.

Submission Deadline

The first high quality code with good test coverage submission wins

Judging Criteria

• Clean code
• Less bugs

Winner Announcement Date

TBD

Bounty

• 1 ETh to the first person who raises PR to fix the bug with a complete test.

Issue summary

At Kickback, we send a list of participants who were checked in as a bitmap to save gas cost.

eg: when 300 people RSVPed and i1, i2, i256, i257, i298, i299 attended, we send bitmap of 2 bytes containing the following.

finalise([110, 11000000000000000000000000000000000000000011])

NOTE: Bitmap starts from right to left so 110 is 0, 1, 1

For more info, please refer to our test.

At the last EthLondon hackathon, we had a dozen of reports from participants who could not withdraw despite marked as "checked in" because their transactions got reverted with message 'Fail with error 'event still active or you did not attend''

After our analysis, it turned out isAttended(address) that the logic to return whether the user has attended or not does not match by one row after 123rd participant.

The column C(bitmap) is derived from the bitmap info sent at finalisation at etherscan

Input data

0xe17e082b0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000100000000000f7fdffffdadbfaffefffb57ff87dbddd2f797ef7dfbfcfceff4df

Hex f7fdffffdadbfaffefffb57ff87dbddd2f797ef7dfbfcfceff4df => Bin 11110111111111011111111111111111110110101101101111111010111111111110111111111111101101010111111111111000011111011011110111011101001011110111100101111110111101111101111110111111110011111100111011111111010011011111 then you reverse the order.

The column D(isAttended) is derived by calling the function for each address

    function isAttended(address _addr) public view returns (bool){
        if (!isRegistered(_addr) || !ended) {
            return false;
        }
        // check the attendance maps
        else {
            Participant storage p = participants[_addr];
            uint256 pIndex = p.index - 1;
            uint256 map = attendanceMaps[uint256(pIndex / 256)];
            return (0 < (map & (2 ** (pIndex % 256))));
        }
    }

Submission criteria

We suspect that the bug is either in our smart contract or js library to encode/decode the bitmap.

• Write a failing test to replicate the error.
• Write a fix to make the test pass.
• Make sure that other tests do not fail.

In addition to simply upgrading, these also need to be done.

• Remove SafeMath lib (safe math is part of solidity check so no longer required)
• Use the latest OpenZeppelin contract
• Replace embedded OZ contracts with the imported ones (Ownable, Destructable, Pausable)
• Use _beforeTokenTransfer instead of overriding transferFrom

Summary

GIVEN a user has 10DAI on their wallet
AND the user has 10ETH on their wallet
AND the user manually do `token.apprve(10DAI)`
WHEN  kickback frontend sends 10ETH when RSVPing (due to a bug/caching)
THEN ETH sent on the smartcontract gets stack forever and no way to recover.

Contract impacted

https://kickback.events/event/0x600ef4d29c8b18e320ef17b4ca31323a5af6b87f
https://etherscan.io/address/0x600ef4d29c8b18e320ef17b4ca31323a5af6b87f

How the error was reported

When a user reported that it sees "RSVP - 10 ETH" instead of "RSVP 10 DAI" on the DAI based event. We still don't know why the frontend was showing the message but when I just checked the smartcode for the possible impact, I discovered the vulnerability,.

The actual impact

None.
All the user who have RSVPed did RSVP properly so no ETH in the contract at this moment.
We stopped RSVP by lowering the cap so no new RSVP will be allowed unless we change the cap.
Minor inconvenience to the user as we have to cancel the event and the user has to re-register in the newly deployed contract.

Solutions

• Cancel the existing event (users have to withdraw manually)
• Merge PR and deploy new contract #33
• Recreate new event.

Background

Currently organiser can only make binary decision about participant and everybody either receives the same payout or 0.

This is achieved by passing bitmap of attendance information at finalise as follows.

function finalize(uint256[] calldata _maps)

By packing all attendance information as a bitmap of uint256, it can handle up to 256 people's attendance information into 1 uint256 slot.

This makes sense in binary result such as meetups, but less flexible for long running challenges.

The proposed change

In addition to pass bitmap where 1 bit represents 1/0 for a participant, allow it to pass bitmap where 8 bit represents 0-255 or 4 bit represents 0-15. By doing so, 8 bit can store up to 32 participant and 4 bit can handle up to 64 participants.

Interface change

function finalize(uint256[] calldata _maps, uint _type)

• _type is unum of 1/4/8

payoutAmount(address)

• Change payoutAmount to take address so that it returns unique payout amount per each participant.

Scope of the work.

• Add functions into smart contract
• Write smart contract unit tests
• Make necessary change on js library and tests
• Write a quick report to compare the gas cost and up to how many participants it can handle within one Ethereum block size.

Evaluation

• Smaller gas cost is better but prefer not to use optcode so that contract remains simpler

Just downloaded and followed the steps.
What could cause test to fail?

From ganache-cli

Transaction: 0x1f625d8fd078caac43c816ba1cc635c1bcc3a0c747b7ca7a7e5c9dd608e85018
Contract created: 0x201e119207151e6d15fd89e9a77f472526e4b819
Gas usage: 6721975
Block Number: 4
Block Time: Wed Dec 04 2019 11:26:29 GMT+0100 (West Africa Standard Time)
Runtime Error: invalid opcode

Contract: ETH Conference
on registration

  1) tokenAddress is empty
> No events were emitted
  on changeName

    2) "before each" hook for "owner can rename the event"
  on changeDeposit

    3) "before each" hook for "owner can change the deposit"
  on setLimitOfParticipants

    4) "before each" hook for "does not allow to register more than the limit"
  on creation
    ✓ name cannot be empty
    ✓ deposit cannot be empty
    ✓ limitOfParticipants cannot be empty
    ✓ coolingPeriod cannot be empty
    ✓ ownerAddress cannot be empty
    ✓ cannot set empty address as an owner (6721975 gas)

    5) can set config values
> No events were emitted
  on registration

    6) "before each" hook for "increments registered"
  on failed registration

    7) "before each" hook for "cannot be registered if wrong amount of deposit is sent"
  finalize using attendee bitmap

    8) "before each" hook for "can be called by owner"
  empty events

    9) "before each" hook for "nothing to withdraw if no one registered"
  on cancel

    10) "before each" hook for "cannot cancel if non owner calls"
  on withdraw

    11) "before each" hook for "cannot withdraw twice"
  on clear

    12) "before each" hook for "cooling period can be set"

Contract: Deployer

13) "before each" hook for "does not accept ETH"

Contract: ERC20 Conference
on changeName

  14) "before each" hook for "owner can rename the event"

Contract: NPM exports
✓ exports contracts
✓ exports valid events

Contract: GroupAdmin
on new

  15) "before each" hook for "owner is admin"

Contract: ETH Conference - stress tests
on big party
finalize large party using attendee bitmaps

    16) requires valid input to succeed
> No events were emitted
    success modes

      17) "before each" hook for "correctly updates attendee records - p1, p2, p256, p257, p298, p299"

·-----------------------------------------------|----------------------------·
| Gas · Block limit: 6721975 gas │
························|·······················|·····························
| Methods · 1 gwei/gas · 146.47 usd/eth │
·············|··········|·······|·······|·······|·············|···············
| Contract · Method · Min · Max · Avg · # calls · usd (avg) │
·------------|----------|-------|-------|-------|-------------|--------------·

8 passing (30s)
17 failing

1. Contract: ETH Conference
   on registration
   tokenAddress is empty:
   Error: Returned error: VM Exception while processing transaction: invalid opcode
   at PromiEvent (node_modules/truffle/build/webpack:/packages/contract/lib/promievent.js:9:1)
   at /home/eka/buildtool/job/amhello/gitcoin/contracts/node_modules/truffle/build/webpack:/packages/contract/lib/execute.js:224:1
   at Function.new (node_modules/truffle/build/webpack:/packages/contract/lib/contract/constructorMethods.js:34:1)
   at Context.createConference (test/conference.js:43:36)
   at Context._callee4$ (test/conference.js:120:27)
   at tryCatch (node_modules/regenerator-runtime/runtime.js:65:40)
   at Generator.invoke [as _invoke] (node_modules/regenerator-runtime/runtime.js:303:22)
   at Generator.prototype.(anonymous function) [as next] (node_modules/regenerator-runtime/runtime.js:117:21)
   at step (test/conference.js:3:191)
   at /home/eka/buildtool/job/amhello/gitcoin/contracts/test/conference.js:3:437
   at new Promise ()
   at Context. (test/conference.js:3:99)

2. Contract: ETH Conference
   on registration
   on changeName
   "before each" hook for "owner can rename the event":
   Error: Returned error: VM Exception while processing transaction: invalid opcode
   at PromiEvent (node_modules/truffle/build/webpack:/packages/contract/lib/promievent.js:9:1)
   at /home/eka/buildtool/job/amhello/gitcoin/contracts/node_modules/truffle/build/webpack:/packages/contract/lib/execute.js:224:1
   at Function.new (node_modules/truffle/build/webpack:/packages/contract/lib/contract/constructorMethods.js:34:1)
   at createConference (test/conference.js:43:36)
   at Context._callee2$ (test/behaviors/conference.behavior.js:74:22)
   at tryCatch (node_modules/regenerator-runtime/runtime.js:65:40)
   at Generator.invoke [as _invoke] (node_modules/regenerator-runtime/runtime.js:303:22)
   at Generator.prototype.(anonymous function) [as next] (node_modules/regenerator-runtime/runtime.js:117:21)
   at step (test/behaviors/conference.behavior.js:3:191)
   at /home/eka/buildtool/job/amhello/gitcoin/contracts/test/behaviors/conference.behavior.js:3:437
   at new Promise ()
   at Context. (test/behaviors/conference.behavior.js:3:99)
   at processImmediate (internal/timers.js:443:21)
   at process.topLevelDomainCallback (domain.js:136:23)

3. Contract: ETH Conference
   on registration
   on changeDeposit
   "before each" hook for "owner can change the deposit":
   Error: Returned error: VM Exception while processing transaction: invalid opcode
   at PromiEvent (node_modules/truffle/build/webpack:/packages/contract/lib/promievent.js:9:1)
   at /home/eka/buildtool/job/amhello/gitcoin/contracts/node_modules/truffle/build/webpack:/packages/contract/lib/execute.js:224:1
   at Function.new (node_modules/truffle/build/webpack:/packages/contract/lib/contract/constructorMethods.js:34:1)
   at createConference (test/conference.js:43:36)
   at Context._callee6$ (test/behaviors/conference.behavior.js:168:22)
   at tryCatch (node_modules/regenerator-runtime/runtime.js:65:40)
   at Generator.invoke [as _invoke] (node_modules/regenerator-runtime/runtime.js:303:22)
   at Generator.prototype.(anonymous function) [as next] (node_modules/regenerator-runtime/runtime.js:117:21)
   at step (test/behaviors/conference.behavior.js:3:191)
   at /home/eka/buildtool/job/amhello/gitcoin/contracts/test/behaviors/conference.behavior.js:3:437
   at new Promise ()
   at Context. (test/behaviors/conference.behavior.js:3:99)
   at processImmediate (internal/timers.js:443:21)
   at process.topLevelDomainCallback (domain.js:136:23)

4. Contract: ETH Conference
   on registration
   on setLimitOfParticipants
   "before each" hook for "does not allow to register more than the limit":
   Error: Returned error: VM Exception while processing transaction: invalid opcode
   at PromiEvent (node_modules/truffle/build/webpack:/packages/contract/lib/promievent.js:9:1)
   at /home/eka/buildtool/job/amhello/gitcoin/contracts/node_modules/truffle/build/webpack:/packages/contract/lib/execute.js:224:1
   at Function.new (node_modules/truffle/build/webpack:/packages/contract/lib/contract/constructorMethods.js:34:1)
   at createConference (test/conference.js:43:36)
   at Context._callee10$ (test/behaviors/conference.behavior.js:263:22)
   at tryCatch (node_modules/regenerator-runtime/runtime.js:65:40)
   at Generator.invoke [as _invoke] (node_modules/regenerator-runtime/runtime.js:303:22)
   at Generator.prototype.(anonymous function) [as next] (node_modules/regenerator-runtime/runtime.js:117:21)
   at step (test/behaviors/conference.behavior.js:3:191)
   at /home/eka/buildtool/job/amhello/gitcoin/contracts/test/behaviors/conference.behavior.js:3:437
   at new Promise ()
   at Context. (test/behaviors/conference.behavior.js:3:99)
   at processImmediate (internal/timers.js:443:21)
   at process.topLevelDomainCallback (domain.js:136:23)

5. Contract: ETH Conference
   on registration
   on creation
   can set config values:
   Error: Returned error: VM Exception while processing transaction: invalid opcode
   at PromiEvent (node_modules/truffle/build/webpack:/packages/contract/lib/promievent.js:9:1)
   at /home/eka/buildtool/job/amhello/gitcoin/contracts/node_modules/truffle/build/webpack:/packages/contract/lib/execute.js:224:1
   at Function.new (node_modules/truffle/build/webpack:/packages/contract/lib/contract/constructorMethods.js:34:1)
   at createConference (test/conference.js:43:36)
   at Context._callee15$ (test/behaviors/conference.behavior.js:403:22)
   at tryCatch (node_modules/regenerator-runtime/runtime.js:65:40)
   at Generator.invoke [as _invoke] (node_modules/regenerator-runtime/runtime.js:303:22)
   at Generator.prototype.(anonymous function) [as next] (node_modules/regenerator-runtime/runtime.js:117:21)
   at step (test/behaviors/conference.behavior.js:3:191)
   at /home/eka/buildtool/job/amhello/gitcoin/contracts/test/behaviors/conference.behavior.js:3:437
   at new Promise ()
   at Context. (test/behaviors/conference.behavior.js:3:99)
   at processImmediate (internal/timers.js:443:21)
   at process.topLevelDomainCallback (domain.js:136:23)

6. Contract: ETH Conference
   on registration
   on registration
   "before each" hook for "increments registered":
   Error: Returned error: VM Exception while processing transaction: invalid opcode
   at PromiEvent (node_modules/truffle/build/webpack:/packages/contract/lib/promievent.js:9:1)
   at /home/eka/buildtool/job/amhello/gitcoin/contracts/node_modules/truffle/build/webpack:/packages/contract/lib/execute.js:224:1
   at Function.new (node_modules/truffle/build/webpack:/packages/contract/lib/contract/constructorMethods.js:34:1)
   at createConference (test/conference.js:43:36)
   at Context._callee16$ (test/behaviors/conference.behavior.js:453:22)
   at tryCatch (node_modules/regenerator-runtime/runtime.js:65:40)
   at Generator.invoke [as _invoke] (node_modules/regenerator-runtime/runtime.js:303:22)
   at Generator.prototype.(anonymous function) [as next] (node_modules/regenerator-runtime/runtime.js:117:21)
   at step (test/behaviors/conference.behavior.js:3:191)
   at /home/eka/buildtool/job/amhello/gitcoin/contracts/test/behaviors/conference.behavior.js:3:437
   at new Promise ()
   at Context. (test/behaviors/conference.behavior.js:3:99)
   at processImmediate (internal/timers.js:443:21)
   at process.topLevelDomainCallback (domain.js:136:23)

7. Contract: ETH Conference
   on registration
   on failed registration
   "before each" hook for "cannot be registered if wrong amount of deposit is sent":
   Error: Returned error: VM Exception while processing transaction: invalid opcode
   at PromiEvent (node_modules/truffle/build/webpack:/packages/contract/lib/promievent.js:9:1)
   at /home/eka/buildtool/job/amhello/gitcoin/contracts/node_modules/truffle/build/webpack:/packages/contract/lib/execute.js:224:1
   at Function.new (node_modules/truffle/build/webpack:/packages/contract/lib/contract/constructorMethods.js:34:1)
   at createConference (test/conference.js:43:36)
   at Context._callee21$ (test/behaviors/conference.behavior.js:577:22)
   at tryCatch (node_modules/regenerator-runtime/runtime.js:65:40)
   at Generator.invoke [as _invoke] (node_modules/regenerator-runtime/runtime.js:303:22)
   at Generator.prototype.(anonymous function) [as next] (node_modules/regenerator-runtime/runtime.js:117:21)
   at step (test/behaviors/conference.behavior.js:3:191)
   at /home/eka/buildtool/job/amhello/gitcoin/contracts/test/behaviors/conference.behavior.js:3:437
   at new Promise ()
   at Context. (test/behaviors/conference.behavior.js:3:99)
   at processImmediate (internal/timers.js:443:21)
   at process.topLevelDomainCallback (domain.js:136:23)

8. Contract: ETH Conference
   on registration
   finalize using attendee bitmap
   "before each" hook for "can be called by owner":
   Error: Returned error: VM Exception while processing transaction: invalid opcode
   at PromiEvent (node_modules/truffle/build/webpack:/packages/contract/lib/promievent.js:9:1)
   at /home/eka/buildtool/job/amhello/gitcoin/contracts/node_modules/truffle/build/webpack:/packages/contract/lib/execute.js:224:1
   at Function.new (node_modules/truffle/build/webpack:/packages/contract/lib/contract/constructorMethods.js:34:1)
   at createConference (test/conference.js:43:36)
   at Context._callee24$ (test/behaviors/conference.behavior.js:679:22)
   at tryCatch (node_modules/regenerator-runtime/runtime.js:65:40)
   at Generator.invoke [as _invoke] (node_modules/regenerator-runtime/runtime.js:303:22)
   at Generator.prototype.(anonymous function) [as next] (node_modules/regenerator-runtime/runtime.js:117:21)
   at step (test/behaviors/conference.behavior.js:3:191)
   at /home/eka/buildtool/job/amhello/gitcoin/contracts/test/behaviors/conference.behavior.js:3:437
   at new Promise ()
   at Context. (test/behaviors/conference.behavior.js:3:99)
   at processImmediate (internal/timers.js:443:21)
   at process.topLevelDomainCallback (domain.js:136:23)

9. Contract: ETH Conference
   on registration
   empty events
   "before each" hook for "nothing to withdraw if no one registered":
   Error: Returned error: VM Exception while processing transaction: invalid opcode
   at PromiEvent (node_modules/truffle/build/webpack:/packages/contract/lib/promievent.js:9:1)
   at /home/eka/buildtool/job/amhello/gitcoin/contracts/node_modules/truffle/build/webpack:/packages/contract/lib/execute.js:224:1
   at Function.new (node_modules/truffle/build/webpack:/packages/contract/lib/contract/constructorMethods.js:34:1)
   at createConference (test/conference.js:43:36)
   at Context._callee36$ (test/behaviors/conference.behavior.js:1047:22)
   at tryCatch (node_modules/regenerator-runtime/runtime.js:65:40)
   at Generator.invoke [as _invoke] (node_modules/regenerator-runtime/runtime.js:303:22)
   at Generator.prototype.(anonymous function) [as next] (node_modules/regenerator-runtime/runtime.js:117:21)
   at step (test/behaviors/conference.behavior.js:3:191)
   at /home/eka/buildtool/job/amhello/gitcoin/contracts/test/behaviors/conference.behavior.js:3:437
   at new Promise ()
   at Context. (test/behaviors/conference.behavior.js:3:99)
   at processImmediate (internal/timers.js:443:21)
   at process.topLevelDomainCallback (domain.js:136:23)

10. Contract: ETH Conference
    on registration
    on cancel
    "before each" hook for "cannot cancel if non owner calls":
    Error: Returned error: VM Exception while processing transaction: invalid opcode
    at PromiEvent (node_modules/truffle/build/webpack:/packages/contract/lib/promievent.js:9:1)
    at /home/eka/buildtool/job/amhello/gitcoin/contracts/node_modules/truffle/build/webpack:/packages/contract/lib/execute.js:224:1
    at Function.new (node_modules/truffle/build/webpack:/packages/contract/lib/contract/constructorMethods.js:34:1)
    at createConference (test/conference.js:43:36)
    at Context._callee39$ (test/behaviors/conference.behavior.js:1146:22)
    at tryCatch (node_modules/regenerator-runtime/runtime.js:65:40)
    at Generator.invoke [as _invoke] (node_modules/regenerator-runtime/runtime.js:303:22)
    at Generator.prototype.(anonymous function) [as next] (node_modules/regenerator-runtime/runtime.js:117:21)
    at step (test/behaviors/conference.behavior.js:3:191)
    at /home/eka/buildtool/job/amhello/gitcoin/contracts/test/behaviors/conference.behavior.js:3:437
    at new Promise ()
    at Context. (test/behaviors/conference.behavior.js:3:99)
    at processImmediate (internal/timers.js:443:21)
    at process.topLevelDomainCallback (domain.js:136:23)

11. Contract: ETH Conference
    on registration
    on withdraw
    "before each" hook for "cannot withdraw twice":
    Error: Returned error: VM Exception while processing transaction: invalid opcode
    at PromiEvent (node_modules/truffle/build/webpack:/packages/contract/lib/promievent.js:9:1)
    at /home/eka/buildtool/job/amhello/gitcoin/contracts/node_modules/truffle/build/webpack:/packages/contract/lib/execute.js:224:1
    at Function.new (node_modules/truffle/build/webpack:/packages/contract/lib/contract/constructorMethods.js:34:1)
    at createConference (test/conference.js:43:36)
    at Context._callee44$ (test/behaviors/conference.behavior.js:1393:22)
    at tryCatch (node_modules/regenerator-runtime/runtime.js:65:40)
    at Generator.invoke [as _invoke] (node_modules/regenerator-runtime/runtime.js:303:22)
    at Generator.prototype.(anonymous function) [as next] (node_modules/regenerator-runtime/runtime.js:117:21)
    at step (test/behaviors/conference.behavior.js:3:191)
    at /home/eka/buildtool/job/amhello/gitcoin/contracts/test/behaviors/conference.behavior.js:3:437
    at new Promise ()
    at Context. (test/behaviors/conference.behavior.js:3:99)
    at processImmediate (internal/timers.js:443:21)
    at process.topLevelDomainCallback (domain.js:136:23)

12. Contract: ETH Conference
    on registration
    on clear
    "before each" hook for "cooling period can be set":
    Error: Returned error: VM Exception while processing transaction: invalid opcode
    at PromiEvent (node_modules/truffle/build/webpack:/packages/contract/lib/promievent.js:9:1)
    at /home/eka/buildtool/job/amhello/gitcoin/contracts/node_modules/truffle/build/webpack:/packages/contract/lib/execute.js:224:1
    at Function.new (node_modules/truffle/build/webpack:/packages/contract/lib/contract/constructorMethods.js:34:1)
    at createConference (test/conference.js:43:36)
    at Context._callee48$ (test/behaviors/conference.behavior.js:1531:22)
    at tryCatch (node_modules/regenerator-runtime/runtime.js:65:40)
    at Generator.invoke [as _invoke] (node_modules/regenerator-runtime/runtime.js:303:22)
    at Generator.prototype.(anonymous function) [as next] (node_modules/regenerator-runtime/runtime.js:117:21)
    at step (test/behaviors/conference.behavior.js:3:191)
    at /home/eka/buildtool/job/amhello/gitcoin/contracts/test/behaviors/conference.behavior.js:3:437
    at new Promise ()
    at Context. (test/behaviors/conference.behavior.js:3:99)
    at processImmediate (internal/timers.js:443:21)
    at process.topLevelDomainCallback (domain.js:136:23)

13. Contract: Deployer
    "before each" hook for "does not accept ETH":
    Error: Returned error: VM Exception while processing transaction: invalid opcode
    at PromiEvent (node_modules/truffle/build/webpack:/packages/contract/lib/promievent.js:9:1)
    at /home/eka/buildtool/job/amhello/gitcoin/contracts/node_modules/truffle/build/webpack:/packages/contract/lib/execute.js:224:1
    at Function.new (node_modules/truffle/build/webpack:/packages/contract/lib/contract/constructorMethods.js:34:1)
    at _callee$ (test/deployer.js:38:32)
    at tryCatch (node_modules/regenerator-runtime/runtime.js:65:40)
    at Generator.invoke [as _invoke] (node_modules/regenerator-runtime/runtime.js:303:22)
    at Generator.prototype.(anonymous function) [as next] (node_modules/regenerator-runtime/runtime.js:117:21)
    at step (test/deployer.js:9:191)
    at /home/eka/buildtool/job/amhello/gitcoin/contracts/test/deployer.js:9:361
    at processTicksAndRejections (internal/process/task_queues.js:86:5)

14. Contract: ERC20 Conference
    "before each" hook for "owner can rename the event":
    Error: Returned error: VM Exception while processing transaction: invalid opcode
    at PromiEvent (node_modules/truffle/build/webpack:/packages/contract/lib/promievent.js:9:1)
    at /home/eka/buildtool/job/amhello/gitcoin/contracts/node_modules/truffle/build/webpack:/packages/contract/lib/execute.js:224:1
    at Function.new (node_modules/truffle/build/webpack:/packages/contract/lib/contract/constructorMethods.js:34:1)
    at Context._callee3$ (test/erc20_conference.js:28:29)
    at tryCatch (node_modules/regenerator-runtime/runtime.js:65:40)
    at Generator.invoke [as _invoke] (node_modules/regenerator-runtime/runtime.js:303:22)
    at Generator.prototype.(anonymous function) [as next] (node_modules/regenerator-runtime/runtime.js:117:21)
    at step (test/erc20_conference.js:3:191)
    at /home/eka/buildtool/job/amhello/gitcoin/contracts/test/erc20_conference.js:3:437
    at new Promise ()
    at Context. (test/erc20_conference.js:3:99)
    at web3.eth.getBlockNumber.then.result (node_modules/truffle/build/webpack:/packages/core/lib/testing/testrunner.js:161:1)
    at processTicksAndRejections (internal/process/task_queues.js:86:5)

15. Contract: GroupAdmin
    "before each" hook for "owner is admin":
    Error: Returned error: VM Exception while processing transaction: invalid opcode
    at PromiEvent (node_modules/truffle/build/webpack:/packages/contract/lib/promievent.js:9:1)
    at /home/eka/buildtool/job/amhello/gitcoin/contracts/node_modules/truffle/build/webpack:/packages/contract/lib/execute.js:224:1
    at Function.new (node_modules/truffle/build/webpack:/packages/contract/lib/contract/constructorMethods.js:34:1)
    at Context._callee$ (test/group_admin.js:25:46)
    at tryCatch (node_modules/regenerator-runtime/runtime.js:65:40)
    at Generator.invoke [as _invoke] (node_modules/regenerator-runtime/runtime.js:303:22)
    at Generator.prototype.(anonymous function) [as next] (node_modules/regenerator-runtime/runtime.js:117:21)
    at step (test/group_admin.js:3:191)
    at /home/eka/buildtool/job/amhello/gitcoin/contracts/test/group_admin.js:3:437
    at new Promise ()
    at Context. (test/group_admin.js:3:99)
    at web3.eth.getBlockNumber.then.result (node_modules/truffle/build/webpack:/packages/core/lib/testing/testrunner.js:161:1)
    at processTicksAndRejections (internal/process/task_queues.js:86:5)

16. Contract: ETH Conference - stress tests
    on big party
    finalize large party using attendee bitmaps
    requires valid input to succeed:
    Error: Returned error: VM Exception while processing transaction: invalid opcode
    at PromiEvent (node_modules/truffle/build/webpack:/packages/contract/lib/promievent.js:9:1)
    at /home/eka/buildtool/job/amhello/gitcoin/contracts/node_modules/truffle/build/webpack:/packages/contract/lib/execute.js:224:1
    at Function.new (node_modules/truffle/build/webpack:/packages/contract/lib/contract/constructorMethods.js:34:1)
    at createConference (test/stress.js:42:36)
    at Context._callee2$ (test/behaviors/conferenceFinalize.behavior.js:65:34)
    at tryCatch (node_modules/regenerator-runtime/runtime.js:65:40)
    at Generator.invoke [as _invoke] (node_modules/regenerator-runtime/runtime.js:303:22)
    at Generator.prototype.(anonymous function) [as next] (node_modules/regenerator-runtime/runtime.js:117:21)
    at step (test/behaviors/conferenceFinalize.behavior.js:3:191)
    at /home/eka/buildtool/job/amhello/gitcoin/contracts/test/behaviors/conferenceFinalize.behavior.js:3:437
    at new Promise ()
    at /home/eka/buildtool/job/amhello/gitcoin/contracts/test/behaviors/conferenceFinalize.behavior.js:3:99
    at createConferenceAndRegisterParticipants (test/behaviors/conferenceFinalize.behavior.js:102:32)
    at Suite._callee4$ (test/behaviors/conferenceFinalize.behavior.js:120:22)
    at tryCatch (node_modules/regenerator-runtime/runtime.js:65:40)
    at Generator.invoke [as _invoke] (node_modules/regenerator-runtime/runtime.js:303:22)
    at Generator.prototype.(anonymous function) [as next] (node_modules/regenerator-runtime/runtime.js:117:21)
    at step (test/behaviors/conferenceFinalize.behavior.js:3:191)
    at /home/eka/buildtool/job/amhello/gitcoin/contracts/test/behaviors/conferenceFinalize.behavior.js:3:437
    at new Promise ()
    at Context. (test/behaviors/conferenceFinalize.behavior.js:3:99)

17. Contract: ETH Conference - stress tests
    on big party
    finalize large party using attendee bitmaps
    success modes
    "before each" hook for "correctly updates attendee records - p1, p2, p256, p257, p298, p299":
    Error: Returned error: VM Exception while processing transaction: invalid opcode
    at PromiEvent (node_modules/truffle/build/webpack:/packages/contract/lib/promievent.js:9:1)
    at /home/eka/buildtool/job/amhello/gitcoin/contracts/node_modules/truffle/build/webpack:/packages/contract/lib/execute.js:224:1
    at Function.new (node_modules/truffle/build/webpack:/packages/contract/lib/contract/constructorMethods.js:34:1)
    at createConference (test/stress.js:42:36)
    at Context._callee2$ (test/behaviors/conferenceFinalize.behavior.js:65:34)
    at tryCatch (node_modules/regenerator-runtime/runtime.js:65:40)
    at Generator.invoke [as _invoke] (node_modules/regenerator-runtime/runtime.js:303:22)
    at Generator.prototype.(anonymous function) [as next] (node_modules/regenerator-runtime/runtime.js:117:21)
    at step (test/behaviors/conferenceFinalize.behavior.js:3:191)
    at /home/eka/buildtool/job/amhello/gitcoin/contracts/test/behaviors/conferenceFinalize.behavior.js:3:437
    at new Promise ()
    at /home/eka/buildtool/job/amhello/gitcoin/contracts/test/behaviors/conferenceFinalize.behavior.js:3:99
    at createConferenceAndRegisterParticipants (test/behaviors/conferenceFinalize.behavior.js:102:32)
    at Suite._callee5$ (test/behaviors/conferenceFinalize.behavior.js:149:24)
    at tryCatch (node_modules/regenerator-runtime/runtime.js:65:40)
    at Generator.invoke [as _invoke] (node_modules/regenerator-runtime/runtime.js:303:22)
    at Generator.prototype.(anonymous function) [as next] (node_modules/regenerator-runtime/runtime.js:117:21)
    at step (test/behaviors/conferenceFinalize.behavior.js:3:191)
    at /home/eka/buildtool/job/amhello/gitcoin/contracts/test/behaviors/conferenceFinalize.behavior.js:3:437
    at new Promise ()
    at Context. (test/behaviors/conferenceFinalize.behavior.js:3:99)
    at processImmediate (internal/timers.js:443:21)
    at process.topLevelDomainCallback (domain.js:136:23)

error Command failed with exit code 17.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
error Command failed with exit code 17.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.