Just noticed this, in DKEntity.m, the refresh method is defined as:

• (BOOL)refresh {
  return [self refresh];
  }

This just calls itself over and over until the app crashes. I think it should be:

• (BOOL)refresh {
  return [self refresh:nil];
  }

or perhaps:

• (BOOL)refresh {
  NSError* error = nil;
  return [self refresh:&error];
  }