An error occurred while saving item...

Does anyone know what error this is and how to fix this?

This is the screenshot of the issue: https://s3.amazonaws.com/zotero.org/images/forums/u11163605/8r2z2lnf95u7n2onz7td.png

The paper I'm trying to save: https://openaccess.city.ac.uk/id/eprint/35138/1/1-s2.0-S027795362200925X-main.pdf
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