CoreData: warning: Unable to load class named

1.

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Notice that I corrected your entity name to the more appropriate singular.

2.
You should also follow the frequent recommendation to include

@objc(Show)
just above your class.

3.
Also make sure to cast the created managed object to the proper class, as the default would be just NSManagedObject.

var newShow = NSEntityDescription.insertNewObjectForEntityForName("Show",
inManagedObjectContext: context) as Show