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Michael Murray6,037 Points
Arrrggg... Getting a SIGABRT from AppDelegate.swift file
After adding in the Stepper code the compile is successful but it crashes with the following error from AppDelegate file: Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<VendingMachine.ViewController 0x7ff301616af0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key updateQuantity.'