Error ID 434675929 on sync

I have been successfully syncing most of the time to zotero and jungle disk.
Today, I get this error, and the firefox debug output shows that it is trying to download a file that does not exist either on jungle disk or on my local profile. It might exist on the zotero server - how to I stop it from looking for this file? Can it be removed from the zotero server?
  • Update - after repeating the sync attempt several more times, this error mysteriously resolved by itself!

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