iPhone Maps: 'NSInvalidUnarchiveOperationException', reason: 'Could not instantiate class named MKMapView'

*** Terminating app due to uncaught exception 'NSInvalidUnarchiveOperationException', reason: 'Could not instantiate class named MKMapView'

Solution:

in XCode - 

1 . press ctrl on the keyboard + click "Frameworks" folder under "Groups & Files" 

2. Add -> Existing Frameworks...

3. Select MapKit.framework and click Add