error message [-app-name} - Document Preferences

Hi, I am using Zotero in Microsoft word and recently it has started throwing error messages every time I want to add a new citation. Apparently I am not using a valid style. The odd thing is that I always use Chicago and normally set my documents to this style setting at the beginning. But now I cannot even access the document preferences anymore as it always throws the same error message. I already completely uninstalled Zotero from my Mac and did a software update before reinstalling Zotero. It worked for one morning but now I have the same problem again. I assume it is a Zotero and not a Microsoft word problem as I also get an error message when I try to copy a citation via the function "create bibliography from item".
Do you have any idea what I could do to solve this issue? Thank you!
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https://s3.amazonaws.com/zotero.org/images/forums/u10085128/hlp4t8r3hm1rmjcygsll.png
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