Getting Serious Application Error With Core Data

Question

I got the following error when deleting an object from my app. Any ideas on how to fix it?

I'm still trying to recreate the process to find out exactly where it is crashing.

Serious application error.  Exception was caught during Core Data change processing.  This is usually a bug within an observer of NSManagedObjectContextObjectsDidChangeNotification.  CoreData could not fulfill a fault for '0x5adc8b0 <x-coredata://2B90C6EC-E046-4508-A1B1-6C4B19BF830D/Session/p1>' with userInfo {
NSAffectedObjectsErrorKey =     (
        "<Session: 0x6f7c830> (entity: Session; id: 0x5adc8b0 <x-coredata://2B90C6EC-E046-4508-A1B1-6C4B19BF830D/Session/p1> ; data: <fault>)"
    );
*** Terminating app due to uncaught exception 'NSObjectInaccessibleException', reason: 'CoreData could not fulfill a fault for '0x5adc8b0 <x-coredata://2B90C6EC-E046-4508-A1B1-6C4B19BF830D/Session/p1>''

Answer 1

A) If you are subscribing to save notifications, Core Data is pointing to a failure there.

B) The "could not fulfill a fault" message is often related to deleting an object, after which some other part of your app tries to access ANY property on it. Yes, even ones where faults were previously fulfilled. The whole object is unusable after a delete.