"URI to Port" consistently has an error in Parallel Chunk Loop

KNIME Analytics Platform
1

I use Parallel Chunk Loops to process files, and they work great for me. However one error that I get consistently is with “URI to Port”, which in my workflow comes immediately after “Parallel Chunk Start”. The first time I try to execute my loop I can count on “URI to Port” failing, with a message of “URI column not set”. Then I check the settings, hit apply - without changing anything - and OK and then the loop runs fine.
Is there an explanation or solution for this?
Essentially, the simplest workflow example I can give of this behavior looks like this:
Input Files -> Port to URI -> Parallel Chunk Start -> URI to Port -> FeatureFinderSuperHirn -> Port to URI -> Parallel Chunk End

The “URI to Port” node will always throw an error until I open the settings and click apply. I don’t change the settings before clicking apply; I just click apply, OK, and then go back and run the last node of this workflow.

2

I should add that “URI to Port” tends to throw the same error after “Parallel Chunk End” as well; I need it to get the files back out from the Chunk; the error is resolved the same way here as it was inside the Loop.

3

Some nodes have to be configured before they can be executed. This is to ensure that the software doesn’t do anything the user wouldn’t expect.

Here for example you get a warning, which forces you to specify the column before any data is being processed. Once setup properly, the node should run without any issues (even in loops).