Sync error: _libraryVersion cannot decrease

Zotero sync fails with the following error:

_libraryVersion cannot decrease

The last successful sync was six days ago. New items and attachment files are not syncing to Zotero for Android.

Debug ID: D470314044
Report ID: 851923075
Zotero version: 9.0.6
Operating system: Windows
  • This can happen if you deleted your account and then asked for it to be undeleted.

    Upgrade to Zotero 10 via Help → "Check for Updates…", which should be able to handle it.
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