Zotero doesn't recognize its own citations and bibliography

I've been working on the same word document for several weeks now, and now when I open it, the citations are not recognized by Zotero so as the bibliography.
I have the latest update of Zotero, the doc is saved on my computer and when I want to add new citations, it's working fine. Zotero doesn't recognized the old citations.

Thanks in advance for your help
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