@user992 we suspect that this error has to do with the fact the ironPython plugin was not loaded in the moment of loading VisualARQ. We have just released a new update of VisualARQ which fixes this error. VisualARQ 2 - Version 2.12.4 released
Please install it and try to run VisualARQ inside revit again. Let me know if the problem persists.
Cheers,
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