My Zotero plugin cannot get the PDF of the document

Monster_Norma
Why can't my Zotero plugin perform the operation named "Preprint PDF" after fetching documents? And why does my plugin display a red cross in front of "Preprint PDF"?
https://s3.amazonaws.com/zotero.org/images/forums/u18323156/e199d20n1ywgj8d4f8q2.png
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