"Custom UI Runtime Error in Zotero.dotm"

I keep getting this error message whenever I go to the Zotero tab in MS Word
https://s3.amazonaws.com/zotero.org/images/forums/u12630600/l9mhqh7my1qt3ylsszkr.png
It doesn't seem to affect the extension functioning otherwise, though? So I'm not exactly sure what this means or how to make it not appear every time I reopen Word.
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