3.6.5 unsupported operand types for & 'float' and 'int' about eospy HOT 6 CLOSED

Traceback (most recent call last):
  File "C:\Users\Jerry\AppData\Local\Programs\Python\Python36\lib\site-packages\eospy\dynamic_url.py", line 41, in post_url
    r.raise_for_status()
  File "C:\Users\Jerry\AppData\Local\Programs\Python\Python36\lib\site-packages\requests\models.py", line 937, in raise_for_status
    raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 500 Server Error: Internal Server Error for url: https://eos.greymass.com/v1/chain/push_transaction

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "pycleos.py", line 51, in <module>
    resp = ce.push_transaction(trx, key, broadcast=True)
  File "C:\Users\Jerry\AppData\Local\Programs\Python\Python36\lib\site-packages\eospy\cleos.py", line 169, in push_transaction
    return self.post('chain.push_transaction', params=None, data=data, timeout=timeout)
  File "C:\Users\Jerry\AppData\Local\Programs\Python\Python36\lib\site-packages\eospy\cleos.py", line 31, in post
    return cmd.post_url(url, **kwargs)
  File "C:\Users\Jerry\AppData\Local\Programs\Python\Python36\lib\site-packages\eospy\dynamic_url.py", line 43, in post_url
    raise requests.exceptions.HTTPError('Error: {}'.format(r.json()))
requests.exceptions.HTTPError: Error: {'code': 500, 'message': 'Internal Service Error', 'error': {'code': 3050003, 'name': 'eosio_assert_message_exception', 'what': 'eosio_assert_message assertion failure', 'details': [{'message': 'assertion failure with message: unable to find key', 'file': 'wasm_interface.cpp', 'line_number': 917, 'method': 'eosio_assert'}, {'message': 'pending console output: ', 'file': 'apply_context.cpp', 'line_number': 72, 'method': 'exec_one'}]}}

from eospy.cleos import Cleos
import eospy.keys

ce = Cleos(url='https://eos.greymass.com')

key = eospy.keys.EOSKey('MYPRIVATEKEY')

memo = "{'type': 'sell-limit', 'symbol': 'parslseed123-seed-eos', 'price': '0.00124', 'channel': 'API'}"

payload = [
        {
            'args': {
                "from": "myaccount",             # sender
                "to": "receiveraccount,               # receiver
                "quantity": "0.0001 EPRA",           # In EOS
                "memo": str(memo),
            },
            "account": "eosio.token",
            "name": "transfer",
            "authorization": [{
                "actor": "myaccount",
                "permission": "active",
            }],
        }
    ]

#payload[0]['args']['memo'] = str(memo)
print(payload[0]['args']['memo'])
print(payload[0]['args']['quantity'])

#print(memo[0]['type'])

#Converting payload to binary
data=ce.abi_json_to_bin(payload[0]['account'],payload[0]['name'],payload[0]['args'])
#Inserting payload binary form as "data" field in original payload
payload[0]['data']=data['binargs']
#Removing the arguments field
payload[0].pop('args')
#final transaction formed
trx = {"actions":[payload[0]]}

resp = ce.push_transaction(trx, key, broadcast=True)
print(resp)