Attached now the new version of the WorkFlow- If you remove the counting loop and the end loop from the main workflow then t works fine. With this loop, i get the error that i have posted before.
gds1962_labels.xls is for the node named "Sample Labels" in the main workflow
gds1962_tmp.csv if input file for the node "Read Data" that belongs to the metanode "PreProcess".
can you try to insert a merge variables node. It needs the case converter and the row filter as input and the output goes into the reference row filter.
Best, Iris.
PS: I also would need the input for the list files node to have the workflow running. But after I inserted the Merge Variables, the error was gone for me.