Could not locate an NSManagedObjectModel for entity name

[gbanks2001]

Hi there,

I am trying a simple storage of data for an iphone app and using core data but get the following error:

"+entityForName: could not locate an NSManagedObjectModel for entity name 'TimeDate'"

I have created the xcdatamodel under resources and in the header file of the viewcontroller I have

NSManagedObjectContext *managedObjectContext;
and
@property (nonatomic, retain)NSManagedObjectContext *managedObjectContext;

then in the code I have
NSManagedObject *newEntry = [NSEntityDescription insertNewObjectForEntityForName:@"TimeDate" inManagedObjectContext:self.managedObjectContext];

which it fails with an error above.

Can anyone point me in the right direction to as to where I should include NSManagedObjectModel for entity name 'TimeDate'

Thanks in advance.