Test Case:

https://github.com/vpinna80/VTL/blob/master/vtl-bundles/vtl-r/RVTL/src/main/resources/R/user_tests/vtl_scripts/user_defined/self_defined_operator.FAIL

Error:

[1] "Compilation error: it.bancaditalia.oss.vtl.model.data.UnknownValueMetadata$1 cannot be cast to it.bancaditalia.oss.vtl.model.data.ScalarValueMetadata"

Describe the bug
It throws an error at building

[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary for VTL 1.0.4-SNAPSHOT:
[INFO] 
[INFO] VTL ................................................ SUCCESS [  1.322 s]
[INFO] vtl-api ............................................ SUCCESS [ 11.705 s]
[INFO] vtl-types .......................................... SUCCESS [  6.988 s]
[INFO] vtl-domains ........................................ SUCCESS [  3.779 s]
[INFO] vtl-parser ......................................... SUCCESS [ 14.746 s]
[INFO] vtl-transform ...................................... SUCCESS [  5.178 s]
[INFO] vtl-envs ........................................... FAILURE [  2.270 s]
[INFO] vtl-session ........................................ SKIPPED
[INFO] vtl-transform ...................................... SKIPPED
[INFO] vtl-launcher ....................................... SKIPPED
[INFO] vtl-editor ......................................... SKIPPED
[INFO] RVTL ............................................... SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  47.678 s
[INFO] Finished at: 2020-06-09T09:58:35-03:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project vtl-envs: Could not resolve dependencies for project it.bancaditalia.oss.vtl:vtl-envs:jar:1.0.4-SNAPSHOT: Could not find artifact it.bancaditalia.oss:sdmx:jar:1.0.3 in central (https://repo.maven.apache.org/maven2) -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException
[ERROR] 
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR]   mvn <args> -rf :vtl-envs

To Reproduce

 mvn -P with-r -Dsdmx.version=1.0.3  clean package

Expected behavior
A package build

Java complete Stack Trace

Please complete the following information:

• MacOS 10.15.5
• java version "1.8.0_40"
  Java(TM) SE Runtime Environment (build 1.8.0_40-b27)
  Java HotSpot(TM) 64-Bit Server VM (build 25.40-b25, mixed mode)
• R 4.0.0

Additional context

Add usage and setup documentation for VTL Engine Jupyter kernel

Test case: https://github.com/vpinna80/VTL/tree/master/vtl-bundles/vtl-r/RVTL/src/main/resources/R/user_tests/vtl_scripts/numeric/op_with_calculated_scalar.vtl

Error:

ERROR 28/04/2021 10:56:22 [vtl.util.Paginator/Thread-128] - Component m1 not found in [$id1[string], number_var[number]] it.bancaditalia.oss.vtl.exceptions.VTLMissingComponentsException: Component m1 not found in [$id1[string], number_var[number]] at it.bancaditalia.oss.vtl.impl.transform.number.ArithmeticTransformation.lambda$null$7(ArithmeticTransformation.java:125) ~[vtl-transform-1.0.8-SNAPSHOT.jar:?] at java.util.Optional.orElseThrow(Unknown Source) ~[?:1.8.0_192] at it.bancaditalia.oss.vtl.impl.transform.number.ArithmeticTransformation.lambda$null$8(ArithmeticTransformation.java:125) ~[vtl-transform-1.0.8-SNAPSHOT.jar:?] at java.util.stream.Collectors.lambda$toConcurrentMap$59(Unknown Source) ~[?:1.8.0_192] at java.util.stream.ReferencePipeline.lambda$collect$1(Unknown Source) ~[?:1.8.0_192] at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(Unknown Source) ~[?:1.8.0_192] at java.util.HashMap$KeySpliterator.forEachRemaining(Unknown Source) ~[?:1.8.0_192] at java.util.stream.AbstractPipeline.copyInto(Unknown Source) ~[?:1.8.0_192] at java.util.stream.ForEachOps$ForEachTask.compute(Unknown Source) ~[?:1.8.0_192] at java.util.concurrent.CountedCompleter.exec(Unknown Source) ~[?:1.8.0_192] at java.util.concurrent.ForkJoinTask.doExec(Unknown Source) ~[?:1.8.0_192] at java.util.concurrent.ForkJoinTask.doInvoke(Unknown Source) ~[?:1.8.0_192] at java.util.concurrent.ForkJoinTask.invoke(Unknown Source) ~[?:1.8.0_192] at java.util.stream.ForEachOps$ForEachOp.evaluateParallel(Unknown Source) ~[?:1.8.0_192] at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateParallel(Unknown Source) ~[?:1.8.0_192] at java.util.stream.AbstractPipeline.evaluate(Unknown Source) ~[?:1.8.0_192] at java.util.stream.ReferencePipeline.forEach(Unknown Source) ~[?:1.8.0_192] at java.util.stream.ReferencePipeline$Head.forEach(Unknown Source) ~[?:1.8.0_192] at java.util.stream.ReferencePipeline.collect(Unknown Source) ~[?:1.8.0_192] at it.bancaditalia.oss.vtl.impl.transform.number.ArithmeticTransformation.lambda$evalDatasetWithScalar$10(ArithmeticTransformation.java:123) ~[vtl-transform-1.0.8-SNAPSHOT.jar:?] at it.bancaditalia.oss.vtl.impl.types.dataset.AbstractDataSet.lambda$mapKeepingKeys$8(AbstractDataSet.java:162) ~[vtl-types-1.0.8-SNAPSHOT.jar:?] at java.util.stream.ReferencePipeline$3$1.accept(Unknown Source) ~[?:1.8.0_192] at java.util.concurrent.ConcurrentHashMap$KeySpliterator.forEachRemaining(Unknown Source) ~[?:1.8.0_192] at java.util.stream.AbstractPipeline.copyInto(Unknown Source) ~[?:1.8.0_192] at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) ~[?:1.8.0_192] at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source) ~[?:1.8.0_192] at java.util.stream.AbstractPipeline.evaluate(Unknown Source) ~[?:1.8.0_192] at java.util.stream.ReferencePipeline.reduce(Unknown Source) ~[?:1.8.0_192] at it.bancaditalia.oss.vtl.impl.types.dataset.AbstractDataSet.lambda$filteredMappedJoinWithIndex$7(AbstractDataSet.java:145) ~[vtl-types-1.0.8-SNAPSHOT.jar:?] at it.bancaditalia.oss.vtl.impl.types.dataset.LightFDataSet.streamDataPoints(LightFDataSet.java:44) ~[vtl-types-1.0.8-SNAPSHOT.jar:?] at it.bancaditalia.oss.vtl.impl.types.dataset.AbstractDataSet.stream(AbstractDataSet.java:240) ~[vtl-types-1.0.8-SNAPSHOT.jar:?] at it.bancaditalia.oss.vtl.impl.session.CachedDataSet.createUnindexedCache(CachedDataSet.java:281) ~[vtl-session-1.0.8-SNAPSHOT.jar:?] at it.bancaditalia.oss.vtl.impl.session.CachedDataSet.streamDataPoints(CachedDataSet.java:234) ~[vtl-session-1.0.8-SNAPSHOT.jar:?] at it.bancaditalia.oss.vtl.impl.types.dataset.AbstractDataSet.stream(AbstractDataSet.java:240) ~[vtl-types-1.0.8-SNAPSHOT.jar:?] at it.bancaditalia.oss.vtl.util.Paginator.lambda$new$1(Paginator.java:60) ~[vtl-java2r-1.0.8-SNAPSHOT.jar:?] at java.lang.Thread.run(Unknown Source) [?:1.8.0_192]

Dear repository owners, 🌟

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Happy coding! 🌐👩‍💻👨‍💻

In: https://vpinna80.github.io/VTL/documentation.html#examples_toc_r-code

the variable should be named rates:

# retrieve gbp and usd rates from the ECB SDMX web service
rates <- getTimeSeriesTable('ECB', 'EXR.A.USD+GBP.EUR.SP00.A')
# set needed metadata for VTL engine (identifiers and measures)
attr(rates , 'measures') <- 'OBS_VALUE'
attr(rates , 'identifiers') <- c('TIME_PERIOD', 'CURRENCY')

Test case: https://github.com/vpinna80/VTL/tree/master/vtl-bundles/vtl-r/RVTL/src/main/resources/R/user_tests/vtl_scripts/aggregate/sum.FAIL

Error:

Error in .jcall("RJavaTools", "Ljava/lang/Object;", "invokeMethod", cl, : java.lang.ClassCastException: it.bancaditalia.oss.vtl.impl.types.data.NullValue cannot be cast to it.bancaditalia.oss.vtl.model.data.NumberValue

Users cannot load datasets outside of VTL code today. This creates some limitations with the VTL Studio in shinyapps because neither local csv files nor the R environment can be used in that situation (so, only SDMX datasets can be used).

To overcome this limitation, an explicit shiny control could be added to vtl studio, that allows users to upload a dataset in the csv environment. This could be a fileInput button that selects the file, and calls a java API that streams the files and puts it in the csv environment, ready to be used in vtl scripts.

This gets a NullPointerException

d:= substr(a,10);

Back slashes cause an error to be thrown, even double ones

Null values in VTL boolean components are set as false in R. This is due to the jdx package:

Logical NA cannot be represented in primitive Java boolean types. Logical NA
will be coerced to FALSE to align with rJava. When logical NAs are coerced, a
warning is thrown. Java null values in java.lang.Boolean boxed types are also
coerced with a warning.
NA_ASSUMPTION_LOGICAL <- FALSE

https://github.com/floidgilbert/jdx/blob/master/R/jdx/R/Private.R

To be investigated:

• option 1: improve jdx
• option 2: cast to int

Symptom:

ERROR it.bancaditalia.oss.vtl.util.Paginator - A deadlock may have happened in the cache mechanism. Caching for dataset ds_other never completed.

Relevant commits:

• f4d3018
• 3ef6e86
• fd5ec64
• 1c680f7

Using multiple arithmentic operatorsin the same calc, e.g.

ds[x:=calc round..., y:=calc round..., z:=calc round...]

results in a considerable decay in performance.
If the same operation is done in multiple calcs, e.g.

ds[x:=calc round...][y:=calc round...][z:=calc round...]

this does not happen.

In page https://vpinna80.github.io/VTL/RVTL/documentation.html#get-started

the dependencies=TRUE parameter does not work.

The documentation should be changed asking to install all prereq packages by hand:

install.packages('rJava')
install.packages('RJSDMX')
install.packages('igraph')
install.packages('networkD3')
install.packages('shiny')
install.packages('shinyAce')
install.packages('jdx')
install.packages('xtable')
install.packages('dplyr')

Currently the CSV Environment only supports DATE types for the time family (e.g. MYDATE_ID$=date[YYYY-MM-DD]).

TIME_PERIOD type should be supported as well.

This is very similar to #23

Today metadata repositories can be added from SDMX registries or local files, but local files cannot be used with the VTL Studio in shinyapps.

as for #23 it would be useful to add a fileInput button to let the user upload the csv metadata file explicitly from the configuration panel of vtl studio.

NA Values in datasets coming from the R Environment should be mapped to VTL NULL values, but they are not managed correctly. This also prevents some operators to work correctly (e.g. comparisons and null specific functions like nvl and isnull)

Add the possibility to quote strings in the source CSV file, according to excel conventions.

Currently date and time_period objects are not managed by the R environment. We should consider adding support for dates at least for dates:

• from R to VTL: date classes in datatset components shoud be marshalled into VTL dates (YYYY-MM-DD) (this could be a bit tricky as JRI seems not to support dates natively, but it should be feasible anyway). Only date classes will be supported, so it will be up to the user to perform conversins before entering VTL.

• from VTL to R: currently dates and time_period is cast to string because even jdx does not support dates. It should be possible to format everything to a standard R date format (YYYY-MM-DD) and set a flag somewhere that implies recasting once in R (as.Date should be sufficient). An example of flag could be an attribute (e.g. date_columns) that lists all the date components

An example on how to use the engine from within an R program or interactive session is missing in the docs

dsr_3:= ds1[ calc Text_3:= Text_1||Text_2]; /* Text_1 and Text_2 are string measures */

Error:

The two datasets must have the same measures.

With daily data the fill_time_series shows some incorrect behaviours:

1. start dates are skipped in the result dataset
2. Some years are missing

this applies to both single and all options

It should be NULL

The same happens if the string 'NULL' is present

If a date component is specified as [YYYY-MM] in the CSV file, the environment add days too. This is not correct and it has an impact on operators behaviour.

e.g.

csv

$Id_1=String,$Id_2=date[YYYY-MM],Me_1=String
A,2010-01,hello world

dataset

Exception thrown when a numeric measure exists in the dataset.

ds_rep:= replace(ds1,"lorem","LOREM");

java.lang.ClassCastException: it.bancaditalia.oss.vtl.impl.types.data.DoubleValue cannot be cast to it.bancaditalia.oss.vtl.impl.types.data.StringValue

VTLStudio unable to render datasets

e.g.

a:=" test ";
b:="check";
c:=a||b;

In a comparisn (e.g. a > b) NULL values in any operand should lead to a NULL result (at row level). The current implementation returns false and it is an error.

Somethimes in VTLStudio the session switch will not refresh the vtl code, overriding the new session contents with the previous ones. It could be a race condition in the shiny reactive observers.

A new environment should be developed, pointing to a local directory containing csv files having the same format specifed for the CSV Environment.

The Engine will use the file name to match datasets (without .csv extension), so there will not be any need of quotes and tags in the VTL code

This environment will be particularly useful for testing purposes

Missing VTL Engine documentation

Expected documentation missing at VTL Engine documentation

Seems to me like the documentation was pointing to local files, rather than files in the repo. I would also then expect the relevant files to be at "vtl/vtl-bundles/vtl-rest/target/generated-snippets/compile/request-parameters.adoc", although these file does not exist in the repo.

It would be useful for referencing codelists (as sets) and structures (e.g. for the csv and R environments)

... to make it possible to process a VTL program from a terminal.

This code:

b:= ", world!";
ds_r2:= ds1[ calc Text_3:= Text_1||b];

should not pass compilation, but it does and then it fails at runtime. This is a bug.

The search mechnism has a bug. If I use a dataset that either does not exist or is in the R environment, the search is not completed because an error is caught in the CSVPath Env:

java.lang.StringIndexOutOfBoundsException: String index out of range: -3
	at java.lang.String.substring(Unknown Source)
	at it.bancaditalia.oss.vtl.impl.environment.CSVPathEnvironment.mapper(CSVPathEnvironment.java:86)

UPDATE: it seems that this happens only if the searched dataset name is 3 chrs long or less.

a:=att

results in:

INFO 23/04/2021 09:59:23 [vtl.impl.session.VTLSessionImpl/main] - Resolving value of att java.lang.StringIndexOutOfBoundsException: String index out of range: -1 at java.lang.String.substring(Unknown Source) at it.bancaditalia.oss.vtl.impl.environment.CSVPathEnvironment.mapper(CSVPathEnvironment.java:86) at it.bancaditalia.oss.vtl.impl.environment.CSVPathEnvironment.getValueMetadata(CSVPathEnvironment.java:97) at it.bancaditalia.oss.vtl.impl.session.VTLSessionImpl.lambda$acquireValue$10(VTLSessionImpl.java:226) at java.util.stream.ReferencePipeline$3$1.accept(Unknown Source) at java.util.ArrayList$ArrayListSpliterator.tryAdvance(Unknown Source) at java.util.stream.ReferencePipeline.forEachWithCancel(Unknown Source) at java.util.stream.AbstractPipeline.copyIntoWithCancel(Unknown Source) at java.util.stream.AbstractPipeline.copyInto(Unknown Source) at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) at java.util.stream.FindOps$FindOp.evaluateSequential(Unknown Source) at java.util.stream.AbstractPipeline.evaluate(Unknown Source) at java.util.stream.ReferencePipeline.findAny(Unknown Source) at it.bancaditalia.oss.vtl.impl.session.VTLSessionImpl.acquireValue(VTLSessionImpl.java:229) at it.bancaditalia.oss.vtl.impl.session.VTLSessionImpl.lambda$getMetadata$6(VTLSessionImpl.java:162) at it.bancaditalia.oss.vtl.impl.session.VTLSessionImpl.cacheHelper(VTLSessionImpl.java:203) at it.bancaditalia.oss.vtl.impl.session.VTLSessionImpl.getMetadata(VTLSessionImpl.java:162) at it.bancaditalia.oss.vtl.impl.transform.VarIDOperand.getMetadata(VarIDOperand.java:53) at it.bancaditalia.oss.vtl.impl.engine.statement.AssignStatement.getMetadata(AssignStatement.java:87) at it.bancaditalia.oss.vtl.impl.session.VTLSessionImpl.lambda$compile$12(VTLSessionImpl.java:268) at java.util.stream.ReferencePipeline$3$1.accept(Unknown Source) at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(Unknown Source) at java.util.stream.AbstractPipeline.copyInto(Unknown Source) at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source) at java.util.stream.AbstractPipeline.evaluate(Unknown Source) at java.util.stream.ReferencePipeline.collect(Unknown Source) at it.bancaditalia.oss.vtl.impl.session.VTLSessionImpl.compile(VTLSessionImpl.java:269) at sun.reflect.GeneratedMethodAccessor15.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at RJavaTools.invokeMethod(RJavaTools.java:386)

while

a:=atti

in

INFO 23/04/2021 10:00:50 [vtl.impl.session.VTLSessionImpl/main] - Resolving value of atti it.bancaditalia.oss.vtl.exceptions.VTLNestedException: Error evaluating statement 'b := atti'. Error: Alias 'atti' is not bound to this transformation scheme. at it.bancaditalia.oss.vtl.impl.engine.statement.AssignStatement.getMetadata(AssignStatement.java:91) at it.bancaditalia.oss.vtl.impl.session.VTLSessionImpl.lambda$compile$12(VTLSessionImpl.java:268) at java.util.stream.ReferencePipeline$3$1.accept(Unknown Source) at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(Unknown Source) at java.util.stream.AbstractPipeline.copyInto(Unknown Source) at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source) at java.util.stream.AbstractPipeline.evaluate(Unknown Source) at java.util.stream.ReferencePipeline.collect(Unknown Source) at it.bancaditalia.oss.vtl.impl.session.VTLSessionImpl.compile(VTLSessionImpl.java:269) at sun.reflect.GeneratedMethodAccessor15.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at RJavaTools.invokeMethod(RJavaTools.java:386) Caused by: it.bancaditalia.oss.vtl.exceptions.VTLUnboundNameException: Alias 'atti' is not bound to this transformation scheme. at it.bancaditalia.oss.vtl.impl.session.VTLSessionImpl.lambda$null$5(VTLSessionImpl.java:163) at java.util.Optional.orElseThrow(Unknown Source) at it.bancaditalia.oss.vtl.impl.session.VTLSessionImpl.lambda$getMetadata$6(VTLSessionImpl.java:163) at it.bancaditalia.oss.vtl.impl.session.VTLSessionImpl.cacheHelper(VTLSessionImpl.java:203) at it.bancaditalia.oss.vtl.impl.session.VTLSessionImpl.getMetadata(VTLSessionImpl.java:162) at it.bancaditalia.oss.vtl.impl.transform.VarIDOperand.getMetadata(VarIDOperand.java:53) at it.bancaditalia.oss.vtl.impl.engine.statement.AssignStatement.getMetadata(AssignStatement.java:87) ... 13 more INFO 23/04/2021 10:00:50 [vtl.impl.engine.mapping.OpsFactory/main] - Using VTL configuration file: jar:file:/D:/Dati/Profili/e922480/Documents/R/R-4.0.2/library/RVTL/java/vtl-transform-1.0.8-SNAPSHOT.jar!/it/bancaditalia/oss/vtl/impl/engine/mapping/OpsFactory.xml DEBUG 23/04/2021 10:00:50 [vtl.impl.engine.mapping.OpsFactory/168/main] - Loading mappings DEBUG 23/04/2021 10:00:50 [vtl.impl.engine.mapping.OpsFactory/177/main] - Loading tokensets DEBUG 23/04/2021 10:00:50 [vtl.impl.engine.mapping.OpsFactory/184/main] - Loading recursive context DEBUG 23/04/2021 10:00:50 [vtl.impl.engine.mapping.OpsFactory/192/main] - Parsing new context VarIdExprContext containing 'atti'. INFO 23/04/2021 10:00:50 [vtl.impl.session.VTLSessionImpl/main] - Resolving value of atti it.bancaditalia.oss.vtl.exceptions.VTLNestedException: Error evaluating statement 'b := atti'. Error: Alias 'atti' is not bound to this transformation scheme. at it.bancaditalia.oss.vtl.impl.engine.statement.AssignStatement.getMetadata(AssignStatement.java:91) at it.bancaditalia.oss.vtl.impl.session.VTLSessionImpl.lambda$compile$12(VTLSessionImpl.java:268) at java.util.stream.ReferencePipeline$3$1.accept(Unknown Source) at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(Unknown Source) at java.util.stream.AbstractPipeline.copyInto(Unknown Source) at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source) at java.util.stream.AbstractPipeline.evaluate(Unknown Source) at java.util.stream.ReferencePipeline.collect(Unknown Source) at it.bancaditalia.oss.vtl.impl.session.VTLSessionImpl.compile(VTLSessionImpl.java:269) at sun.reflect.GeneratedMethodAccessor15.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at RJavaTools.invokeMethod(RJavaTools.java:386) Caused by: it.bancaditalia.oss.vtl.exceptions.VTLUnboundNameException: Alias 'atti' is not bound to this transformation scheme. at it.bancaditalia.oss.vtl.impl.session.VTLSessionImpl.lambda$null$5(VTLSessionImpl.java:163) at java.util.Optional.orElseThrow(Unknown Source) at it.bancaditalia.oss.vtl.impl.session.VTLSessionImpl.lambda$getMetadata$6(VTLSessionImpl.java:163) at it.bancaditalia.oss.vtl.impl.session.VTLSessionImpl.cacheHelper(VTLSessionImpl.java:203) at it.bancaditalia.oss.vtl.impl.session.VTLSessionImpl.getMetadata(VTLSessionImpl.java:162) at it.bancaditalia.oss.vtl.impl.transform.VarIDOperand.getMetadata(VarIDOperand.java:53) at it.bancaditalia.oss.vtl.impl.engine.statement.AssignStatement.getMetadata(AssignStatement.java:87) ... 13 more

It returns zero in most cases, otherwise differently wrong results

In version 1.0.4 the package DT is used but not listed in the 'imports' section.

The R package jdx has been discontinued. The R VTL code has to be updated to remove any reference to the package.

If no session is selected, the editor panel is active (this happens in particular at vtlStudio start). It should be hidden or deactivated. Alternatively an empty test session could be created by default.