Sorry you’ve had an issue. Let’s see if we can work out what’s going on.
As an aside, there’s probably no point doing the parallel chunk on the Rxn to RInChi node the underlying dll will only be able to process 1 reaction at a time anyway.
Can you double check that you’ve selected a column and than hit ok on the dialog? The error might be a classic case of forgetting to check a column was actually selected which results in trying to get the column name as position -1 which would throw this exception. Opening the dialog and selecting close/cancel because if looks ok isn’t sufficient, it’s important to hit ok.
Unfortunately I don’t see anything in the log from a quick skim, are you able to share an example failing reaction input table with me?