Galaxy: Workflow evaluation problem error

[FredericBGA]

I have try to reproduce an error we are facing (with a much bigger workflow)

The workflow is simple. Filter a collection (withFilter List) based on a file (input dataset) and then select first lines (with Select First) of selected files. The number of line to keep is a Simple input

It works.

But when we try to add another step (in my example Search in textfiles) it fails.

Maybe you can see this error:

Failed to schedule Workflow[id=385,name=Grep Before], problem occurred on WorkflowStep[index=5,type=tool].

Exception: Workflow evaluation problem - failed to find output_name output in step_outputs {}

Using this history and this workflow I think you will be able to reproduce the error.

[mvdbeek]

Thanks for the report, I can reproduce this. https://github.com/galaxyproject/galaxy/issues/8248 should fix the issue.