Data-core NSException - objective-c

Question

I don't know where is my problem because the entity "Utente" exist.
Error code:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+entityForName: nil is not a legal NSManagedObjectContext parameter searching for entity name 'Utente''
*** First throw call stack:
(
0 CoreFoundation 0x0000000101bf0495 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x00000001016f099e objc_exception_throw + 43
2 CoreData 0x0000000101e76599 +[NSEntityDescription entityForName:inManagedObjectContext:] + 217
3 CoreData 0x0000000101eb2e7e +[NSEntityDescription insertNewObjectForEntityForName:inManagedObjectContext:] + 30
4 VucmpraJson 0x000000010000514b -[LoginViewController login:] + 4843
5 UIKit 0x000000010029ef06 -[UIApplication sendAction:to:from:forEvent:] + 80
6 UIKit 0x000000010029eeb4 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 17
7 UIKit 0x000000010037b880 -[UIControl _sendActionsForEvents:withEvent:] + 203
8 UIKit 0x000000010037adc0 -[UIControl touchesEnded:withEvent:] + 530
9 UIKit 0x00000001002d5d05 -[UIWindow _sendTouchesForEvent:] + 701
10 UIKit 0x00000001002d66e4 -[UIWindow sendEvent:] + 925
11 UIKit 0x00000001002ae29a -[UIApplication sendEvent:] + 211
12 UIKit 0x000000010029baed _UIApplicationHandleEventQueue + 9579
13 CoreFoundation 0x0000000101b7fd21 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
14 CoreFoundation 0x0000000101b7f5f2 __CFRunLoopDoSources0 + 242
15 CoreFoundation 0x0000000101b9b46f __CFRunLoopRun + 767
16 CoreFoundation 0x0000000101b9ad83 CFRunLoopRunSpecific + 467
17 GraphicsServices 0x00000001040d0f04 GSEventRunModal + 161
18 UIKit 0x000000010029de33 UIApplicationMain + 1010
19 VucmpraJson 0x0000000100021d13 main + 115
20 libdyld.dylib 0x00000001025f15fd start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
Code:
#property (nonatomic,strong) NSManagedObjectContext* managedObjectContext;
.
.
.
NSManagedObjectContext *context = [self managedObjectContext];
NSManagedObject * Utente = [NSEntityDescription insertNewObjectForEntityForName:#"Utente" inManagedObjectContext:context];
[Utente setValue: emailText.text forKey:#"email"];
NSError *error;
//[context save:&error];
if (![context save:&error]) {
NSLog(#"Whoops, couldn't save: %#", [error localizedDescription]);
}
entities: Utente
attributes: email;password
thx to much guys

Answer 1

nil is not a legal NSManagedObjectContext parameter searching for entity name 'Utente'
means that your managed object context is nil. Check self.managedObjectContext assignment.
edit
if (! [self managedObjectContext]) {
NSLog(#"You will receive your exception");
} else {
// Insert new entity into specified context
}