ios core data cannot find NSManagedObjectModel for entity name 'Cartdetail' with this code - iphone

Question

Hi i'm creating an app that needs to save data in my label content to my core data model which is named as cart.xcdatamodeld and my entity named as Cartdetail.When i press a save button in my app i'm getting following error...
- (void)viewDidLoad {
if (managedObjectContext == nil) {
managedObjectContext = [(AppDelegate *)[[UIApplication sharedApplication] delegate]managedObjectContext];
}
}
- (IBAction)SaveTest:(id)sender {
ViewController2 *second = (ViewController2 *)[NSEntityDescription insertNewObjectForEntityForName:#"Cartdetail" inManagedObjectContext:managedObjectContext];
}
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '+entityForName: could not locate an NSManagedObjectModel for entity name 'Cartdetail''
*** Call stack at first throw:
(
0 CoreFoundation 0x010265a9 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x01444313 objc_exception_throw + 44
2 CoreData 0x00036ebb +[NSEntityDescription entityForName:inManagedObjectContext:] + 187
3 CoreData 0x0006e9eb +[NSEntityDescription insertNewObjectForEntityForName:inManagedObjectContext:] + 59
4 tablevc 0x00009c97 -[Description alertView:clickedButtonAtIndex:] + 519
5 UIKit 0x00621c5f -[UIAlertView(Private) _buttonClicked:] + 296
6 UIKit 0x002784fd -[UIApplication sendAction:to:from:forEvent:] + 119
7 UIKit 0x00308799 -[UIControl sendAction:to:forEvent:] + 67
8 UIKit 0x0030ac2b -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
9 UIKit 0x003097d8 -[UIControl touchesEnded:withEvent:] + 458
10 UIKit 0x0029cded -[UIWindow _sendTouchesForEvent:] + 567
11 UIKit 0x0027dc37 -[UIApplication sendEvent:] + 447
12 UIKit 0x00282f2e _UIApplicationHandleEvent + 7576
13 GraphicsServices 0x01c34992 PurpleEventCallback + 1550
14 CoreFoundation 0x01007944 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
15 CoreFoundation 0x00f67cf7 __CFRunLoopDoSource1 + 215
16 CoreFoundation 0x00f64f83 __CFRunLoopRun + 979
17 CoreFoundation 0x00f64840 CFRunLoopRunSpecific + 208
18 CoreFoundation 0x00f64761 CFRunLoopRunInMode + 97
19 GraphicsServices 0x01c331c4 GSEventRunModal + 217
20 GraphicsServices 0x01c33289 GSEventRun + 115
21 UIKit 0x00286c93 UIApplicationMain + 1160
22 tablevc 0x00001d4a main + 170
23 tablevc 0x00001c95 start + 53
)
terminate called throwing an exception
I'm new to iOS..Please help me..Thanks..

Answer 1

You probably haven't set up your managed object context in AppDelegate!
Take a look at the AppDelegate implementation of the iPhoneCoreDataRecipes example provided by apple:
iPhoneCoreDataRecipes example