Zotero experienced an error updating your document PLEASE HELP

I can't inset/edit any citation or even press the document preferences button without having this message pop up ! I really need help with this as i used Zotero for a really long book i'm working on and i can't see myself doing that all over again manually :/ I'd also like to say that i'm not an expert with computers as a lot of the guys here seem to be so please make it as simple as possible for me ! HELP
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