can't sync, error ID 313761613

Hello, I'm reporting this for another zotero user actually. He has been trying to sync to the zotero server for weeks now. For the most part, all he gets is the spinning arrow. Occasionally he'll get the message to reconcile items in one of his GROUP libraries.

He tried creating a new FF profile and syncing with an empty library, and that's when he got the above error, which he reported.

Any ideas? Thanks!
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