Core Data Syncing with Ensembles: Failed to merge: The operation couldn’t be completed. (CDEErrorDomain error 204.)

Question

I am experiencing the same problems outlined outlined in this bug report. I too synced my data with an old model version, and now I cannot sync again.

I completed the troubleshooting steps in that bug report:

• Deleeched my ensemble
• Deleted the Core Ensembles data in ~/Library/Mobile Documents on my Mac and waited a few minutes to make sure it didn't come back
• Downloaded my container from my phone, deleted everything in caches (AppData/Library/Caches, AppData/Library/Preferences/com.mentalfaculty.ensembles.eventdata, and AppData/Library/Application Support/<my bundle id>/com.mentalfaculty.ensembles.eventdata)
• Deleted my saved iCloud ubiquity token from the app's plist (for good measure)
• Replaced the container on my phone with the modified container after deleting the caches

On trying to sync again, I am still getting Failed to merge: The operation couldn’t be completed. (CDEErrorDomain error 204.)

Since the error message is still "Error in Merge", though, I assume I'm not deleeching or otherwise getting rid of all my Ensembles data somewhere.

Any ideas?