Updating error citing

I'm using Zotero with Google Docs. Some of the cites show "updating" on blue in the footnote, it says that there's a problem with Docks "backend".
I use the same format for all of the books but some of them gave this problem, even though a couple fixed by themselves (misteries of computers...). The book I use the most has some of these cases, even though other references for the same book show no problem.
Debug ID: D1038183013
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