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NPrinting 17 warning "Collection was modified; enumeration operation may not execute."

I have NP 17.5 and ran a NP scheduled publish task and there was a Warning posted in the Task Execution list with the warning text of

Failed report generation for report f6de4840-9a19-4724-93f2-8aa60ada7666 user 3ec802e7-b2db-4b1e-bd51-4ffedc234b37

exception System.Exception: Collection was modified; enumeration operation may not execute. : STACK :

Does anyone know what this means and what causes it?  Thanks.

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