Trouble with Zotero in Google Docs

I was using Zotero in Google Docs during the whole morning without issues. Then in the afternoon not only I cannot add new citations to my document but I cannot add new citations to any document, even empty new ones.

There is always this message (in Portuguese) "Zotero encontrou um erro ao atualizar seu documento. Gostaria de ver as instruções para solução de problemas?"

I use google chrome, and Zotero and the add on are updated.
Do you know what I can do?
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