This error happens when you're trying to uninstall a game using our shared container format through control panel. To resolve this error, uninstall the game using the Battle.net application. If this doesn't work, you can delete the entire game folder and reinstall the base game. To do this:
- Open the Blizzard Battle.net Application
- Navigate to the game that you want to uninstall
- Click the Options button above the news widget
- Select Show in Explorer (show in Finder for Mac)
- Delete the game folder
- Reinstall the game using the Battle.net application.