Yesterday I found in Application Support/CallHistoryDB: Multiline CallHistory.storedata CallHistory.storedata-shm CallHistory.storedata-wal BlockQuote I moved the folder to an external device and killed the original. I setup a new project StoreData, killed the StoreData.xcdatamodeld and replaced it with the model of my project. This works, but before a must Sandbox uncheck.

Yesterday I found in Application Support tree documents : Multiline CallHistory.storedata CallHistory.storedata-shm CallHistory.storedata-wal BlockQuote I moved the docs to an external device and killed the originals, today they were at place again. I would setup a test app, but how do I make ad hoc a failure, so that CD trashes to have a reason to trash the store ?

@Claude31 Hi, thankyou for your reply. I set a breakpoint in applicationDidFinishLaunching: The launch process stops at line 23 (Thread 1) and after two clicks the project runs, but i still could not use debugging. I use macOS 11.2.1, Xcode 11.7 No external frameworks, the shown sample is untouched, except the change of the deployment target to 15.0 After upgrade to Big Sur I used 12.4, then 11.7