Hi all,

I have created a transformation in PDI (7.1.0.0-12) which provides me the results as wanted.
Next step is to provide this data into a report with Designer (PRD 7.1.0.0-12).
Starting the report design wizard I add new data source and choose Pentaho Data Integration.
I add a name and select the saved transformation.ktr.
Here I select JSON input and hit preview, this gives me the following error message:

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------
rg.pentaho.reporting.engine.classic.core.ReportDataFactoryException: Caught Kettle Exception: Check your configuration
at org.pentaho.reporting.engine.classic.extensions.datasources.kettle.KettleDataFactory.queryData(KettleDataFactory.java:100)
at org.pentaho.reporting.ui.datasources.kettle.KettleDataSourceDialog$KettlePreviewWorker.run(KettleDataSourceDialog.java:485)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.pentaho.di.core.exception.KettleException:
We failed to initialize at least one step. Execution can not begin!




at org.pentaho.di.trans.Trans.prepareExecution(Trans.java:1157)
at org.pentaho.reporting.engine.classic.extensions.datasources.kettle.AbstractKettleTransformationProducer.prepareTransformation(AbstractKettleTransformationProducer.java:284)
at org.pentaho.reporting.engine.classic.extensions.datasources.kettle.AbstractKettleTransformationProducer.performQueryOnTransformation(AbstractKettleTransformationProducer.java:248)
at org.pentaho.reporting.engine.classic.extensions.datasources.kettle.AbstractKettleTransformationProducer.performQuery(AbstractKettleTransformationProducer.java:231)
at org.pentaho.reporting.engine.classic.extensions.datasources.kettle.KettleDataFactory.queryData(KettleDataFactory.java:96)
... 2 more


---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

I am using MacOS Sierra 10.12.6.
I don't see anything in the log file in Kettle and I cannot find a log file in designer.
I have searched on this forum but nothing really simular.

Can something explain me this error message?

Thank you!

/Rik