Problems using Zotero in Google Docs

Hi. I have a Google Docs document (with manually inserted references). When I click on Zotero link I get an error message:

Zotero experienced an error updating your document.

Would you like to view troubleshooting instructions?

When I start a new document, I do not get this message when I click on Zotero link. Can someone please advise? Thank you.
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