iphone Core Data Unresolved error while saving

Question

I am getting a strange error message from the core data when trying to save but the problem that the error is not reproducible ( it appears at different times when doing dif

Answer 1

I had transient property of type int that wasn't optional. Obviously, when it was set to 0, 1570 error appear. Just changed all my transient properties to optional. Nil-check logic can be implemented in code if necessary.