Workflow rule doesn't work on production server

I need a rule in my youtrack system that automatically assigns the reporter when the item is fixed. Therefore I create a rule (AucxisWorkflowAutoassignreporter) that you can find attached to this item.
This rule works great on a test server I  am running but when I activate it onto my production environment I got the error "Workflow AucxisWorkflowAutoassignreporter reports error: Can't set value to custom field Assignee
Contact project admin Willem Van Leest WVL@aucxis.com"

I don't see what I'm doing wrong. Any tips / suggestions?

AucxisWorkflowAutoassignreporter.zip (2KB)


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