can't add no more citation

HI! when I try to insert a citation as soon as I press "add citation" I get the message "the highlighted citation is no longer present in the Zotero database. Do you want to select a replacement element? Selecting "no" will delete the identification field for the citation that contains this element, keeping the text of the quotation unchanged but eliminating it from the bibliography". Pressing yes or no doesn't let me insert any more quotes. How can I do?
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