BOM Cost report doesn't work

Epicor version 9.05.701

Production Management / Engineering / Reports / BOM Cost

This report works for some parts when we filter specific parts…but other parts it should work on the report doesn’t run.

I am assuming certain criteria should be met / filled in and something has changed.
In the task agent, it shows ERROR not complete, but the error makes no sense at all.
Any help would be much appreciated.

Does the error constantly happen for the same parts?

Does it matter if those parts are manually selected, or if the report is run unfiltered?

Do those parts pass the Validate BOM in Engineering workbench?

seems like a restart of the app servers sorted it.