I found this topic because I had a very similar problem. The problem in my code was two identical method names.
Once called with the button action:
@IBAction func save() {..}
then in the file AppDelegate in the method saveContext in a do {} catch command:
func saveContext() {
...
try context.save()
...
}
I renamed the button action, redo the connection and the code is now executing properly.
lauk
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