Remove unused error and comment that has been addressed.
Remove unused error and comment that has been addressed.

gaurav1981/CoreDataStack,bignerdranch/CoreDataStack,gaurav1981/CoreDataStack,binhho/CoreDataStack,sugar2010/CoreDataStack,binhho/CoreDataStack,sugar2010/CoreDataStack,bignerdranch/CoreDataStack,bignerdranch/CoreDataStack,phatblat/CoreDataStack,phatblat/CoreDataStack,Sully73/CoreDataStack,Sully73/CoreDataStack