I was attempting to create a process model to add / remove users that was shown on the Appian website. I can link if necessary. Attached is my version of the process
When trying to save, I get the error:
I did look on the discussion board but could not a solution.
Thanks!
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Check all your "Group" nodes (looks like you have Add Group Members and Remove Group Members) - I believe this error is telling you one of the required input fields is blank in one of those.