Zotero could not find any identifiers in your input. Please verify your input and try again.

Dear colleagues,
when I use the function "add items by identifier", after the insertion of the PMID or DOI... Zotero said to me: "Zotero could not find any identifiers in your input. Please verify your input and try again."
This voice is present at each insertion of DOI or PMID or other systems and I can't insert any other article on my personal library.
What did I have to do for inserting article with the identifier??
Please help me
Thanks
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