Invalid Remote ID
The Xero Projects API returned an item without a unique identifier ("RemoteID"). SyncHub requires this RemoteID in order to correctly create new records, or update existing ones.
By the time you have observed this error, our developers will already have been notified and have likely already provided a fix. To check if this is the case, simply re-sync the time period or specific item in question.
If you continue to observe this error, please feel free to reach out to our team for clarification around timings and fixes.