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I’ve noticed that this line is causing problem
NSManagedObject *newContact = [NSEntityDescription insertNewObjectForEntityForName:@"Contacts" inManagedObjectContext:context];
Error:
Undefined symbols for architecture i386:
"_OBJC_CLASS_$_NSEntityDescription", referenced from:
objc-class-ref in LoginViewController.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Looks like you forgot to link CoreData framework in your project settings.