'Fatal Exception: NSInternalInconsistencyException - Xcode

for a Customer I should fix two crashes with CoreData.

This NSPersistentStoreCoordinator has no persistent stores (schema mismatch or migration failure). It cannot perform a save operation.
This NSPersistentStoreCoordinator has no persistent stores (disk full). It cannot perform a save operation.

There are no differences in the entities, the model is the same: I cannot reproduce the crash that I look on Firebase.

Everything seems correct: I have experience with coredata and have checked every possible problem of Migration, etc.

Any suggestion?

Solution 1:^[1]

Could the singleton give me a problem? That is, it might be different to declare "var singleton = XXX.shared" and use like singleton.context instead of "XXX.shared.delete()"

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'Fatal Exception: NSInternalInconsistencyException - Xcode

Solution 1:[1]

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Solution 1:^[1]