You need to deploy the errors and see what happens. Inside this error (which you can set a breakpoint on objc_exception_thrown to catch) is a userInfo dictionary that you can poll to find out what the main errors are.
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What does your creation code look like NSPersistentStoreCoordinator?
You added a breakpoint and did po [error userInfo]it to see if there were any additional errors in the user information?
Core Data can and does send you a hierarchy of errors, and often on a small amount of information is displayed at the top error. Expanding errors using the debugger is best to identify the root causes.
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