Error "no matching reference was found"

Hello,

I have to create a digital library. I downloaded all the documents I need and when I put it on a new library, an error message appeared "no matching reference was found".

I don't know what I have to do to avoid that and I don't even know if it could create a problem later ( I wil share my library ).

Can I have some help please ?

Thank you in advance
Cordially
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