gistfile1.m

if (![persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeUrl options:nil error:&error]) {
    if ([error code] == NSPersistentStoreIncompatibleVersionHashError) {
        NSLog(@"Persistent Store Incompatible Version error. Please check %@", storeUrl);
    } else {
        NSLog([error description]);
    }
}