Problem with Aleph

Zotero recognizes Aleph, but has an error message when we try to save a reference. We use the 518 version. Our catalog is in French langage.
http://bibli.polytechnique.fr/F/?func=file&file_name=find-b&local_base=CATAL

Although it works in several other French speaking libraries using the same version.
For instance Université libre de Liège
http://source.ulg.ac.be/F/?func=find-c-0

Both libraries use the MARC21 standard

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