When I ran the app on PG151 I received a SIGABRT error in the app delegate. The solution:
In the DataModel file, Entity → Class → Module defaulted to “Global Namespace”. Using the drop down menu to switch this to “Current Product Module” solved the issue (see Pg. 141).
Just a tip in case anyone runs into the same error. This took me many hours to solve, and of course it was the last place I looked. If I missed this step in the book, please let me know.
Kyle