I have the same issue with the same versions of Xcode. CoreUI: _Bool CUIValidateIdiomSubtypes(NSInteger, NSUInteger *) passed a device subtype '2752' and idiom '2':pad that are not a matching pair, subtype is not valid with given idiom. Assuming subtype should be 0 instead.

I have the same error on one of my projects ... CoreUI: _Bool CUIValidateIdiomSubtypes(NSInteger, NSUInteger *) passed a device subtype '2752' and idiom '2':pad that are not a matching pair, subtype is not valid with given idiom. Assuming subtype should be 0 instead.