iPhone app crashes on startup

[geo_cc]

My app uses an sqlite database managed with core-data. These are the errors I found in the debug files. On the simulator it works just fine, no problems at all. Made the app in Xcode 4.2 iOS 5 and tried it on an iPhone 4 4.2.1.

Incident Identifier: 65E195D6-C583-4CA2-8017-1AEC56FAFBD4
    CrashReporter Key:   4ebf8de224465a40c94ea40cffb742f345888ef0
    Hardware Model:      iPhone3,1
    Process:         Jobs [158]
    Path:            /Applications/Jobs.app/Jobs
    Identifier:      Jobs
    Version:         ??? (???)
    Code Type:       ARM (Native)
    Parent Process:  punchd [1]    
    Date/Time:       2011-12-01 13:53:22.288 +0000
    OS Version:      iPhone OS 4.2.1 (8C148)
    Report Version:  104    
    Exception Type:  EXC_CRASH (SIGABRT)
    Exception Codes: 0x00000000, 0x00000000
    Crashed Thread:  0    
    Thread 0 Crashed:   
    4   Jobs                            0x00002c74 0x1000 + 7284
    5   Jobs                            0x00002a0a 0x1000 + 6666
    6   Jobs                            0x00003012 0x1000 + 8210   
    36  Jobs                            0x0000283c 0x1000 + 6204
    37  Jobs                            0x000027f4 0x1000 + 6132
Error 4 leads to this line of code:

__persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
    if (![__persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:options error:&error])
    {        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
        abort(); //this one to be exact
    }    
Error 5 leads to this line of code:

- (NSManagedObjectContext *)managedObjectContext
{    if (__managedObjectContext != nil)
    {        return __managedObjectContext;    }    
    NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator]; //this line with error;
    if (coordinator != nil)
    {        __managedObjectContext = [[NSManagedObjectContext alloc] init];
        [__managedObjectContext setPersistentStoreCoordinator:coordinator];    }
    return __managedObjectContext;}
These were in the app delegate. Now the 6th error is from the main view, in the ViewDidLoad:

 if (managedObjectContext == nil) 
    { 
        managedObjectContext = [(MyAppDelegate *)[[UIApplication sharedApplication] delegate] managedObjectContext]; //this line;
        NSLog(@" %@",  managedObjectContext);}

[RickSDK]

was it a fresh install of the app on the iPhone 4 4.2.1? Or was it running a previous version and started crashing when you updated it?

just asking because if you change your database schema the app will crash unless you completely delete the old version and reinstall a new version.