Failed to insert change into history

Can someone explain
collection: failed to insert change into history during initial sync of collection after copying 10404 documents: error incrementing the version counter for (appID=“5…5e”, fileIdent=12869); context deadline exceeded

Keeps saying Enabling Sync… copying data
Then flashes the above and back to Enabling Sync…
over and over

Thanks in advance

@Barry_Fawthrop Can you email me at with the URL link to your realm app and we can take a look for you on the backend