"Cannot load NSManagedObjectModel. nil is an illegal URL parameter"

Question

I want to get the managed object context from AppDelegate, but the app crashed after I put the two lines of code into the method even I did nothing else, and there was a message in debug area:"CoreData: Cannot load NSManagedObjectModel. nil is an illegal URL parameter..."

The code added in my method:

AppDelegate *delegate = [UIApplication sharedApplication].delegate;
NSManagedObjectContext *managedObjectContext = delegate.managedObjectContext;

-managedObjectModel method in AppDelegate:

- (NSManagedObjectModel *)managedObjectModel {
// The managed object model for the application. It is a fatal error for the application not to be able to find and load its model.
if (_managedObjectModel != nil) {
    return _managedObjectModel;
}
NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"FoodPin" withExtension:@"momd"];
_managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
return _managedObjectModel;
}

and the -managedObjectContext method:

- (NSManagedObjectContext *)managedObjectContext {
// Returns the managed object context for the application (which is already bound to the persistent store coordinator for the application.)
if (_managedObjectContext != nil) {
    return _managedObjectContext;
}

NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];
if (!coordinator) {
    return nil;
}
_managedObjectContext = [[NSManagedObjectContext alloc]initWithConcurrencyType:NSPrivateQueueConcurrencyType];
[_managedObjectContext setPersistentStoreCoordinator:coordinator];
return _managedObjectContext;
}

"FoodPin" is my project name.So what's wrong here?I'm new to iPhone programming (Core Data in particular).

Can anyone help me?

Thanks...

The problem is this `[[NSBundle mainBundle] URLForResource:@"FoodPin" withExtension:@"momd"];` is returning nil into `modelURL`. Do you have a Core Data model named FoodPin in your project? — Steve Wilford, Oct 06 '15 at 10:16
Oh..thanks a lot, I forgot to alter my name of .xcdatamodeld file! — ZyusAn, Oct 06 '15 at 10:40

score 26 · Accepted Answer · answered Oct 06 '15 at 10:44

26

The problem is this line:

NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"FoodPin" withExtension:@"momd"];

modelURL is nil meaning that the system couldn't find the resource FoodPin.momd.

Make sure you have a Core Data model in your project named FoodPin. It will appear as FoodPin.xcdatamodeld in the Project Navigator.

answered Oct 06 '15 at 10:44

Steve Wilford

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2

NOTE: Even though the file appears with extension `xcdatamodeld`, the method should still be looking for extension `momd` (as it is in the code in this answer). – FeifanZ Dec 27 '15 at 15:34
3

Even though I have the file the file in my project with same name, I get the same error. – Chanchal Raj Jan 20 '16 at 13:30
@ChanchalRaj Any solution so far ? – Jack Jul 16 '18 at 06:08

score 5 · Answer 2 · answered Aug 05 '16 at 13:22

5

I had the same problem but for me the modelURL was correctly set. The problem was that my *.xcdatamodeld file was not in the Copy bundle ressources anymore. I don't know why it disappear but to add it again fix the problem.

Here is how to fix it : You project > Build Phases > Copy Bundle ressources > "+" button and select you xcdatamodeld file

answered Aug 05 '16 at 13:22

Tom Giraudet

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9

This solved my problem. I wonder what happened. Looking at my commit history, the *. xcdatamodeld was never in the Copy Bundle Resources build phase. I'm using Xcode 8 beta 6. – Stian Høiland Aug 23 '16 at 11:35
I removed the *. xcdatamodeld from the Copy Bundle Resources build phase, and the problem remains solved. Probably a caching issue with Xcode, which means that doing a Clean or Clean Build Folder might solve this issue for others. – Stian Høiland Aug 23 '16 at 11:45

score 0 · Answer 3 · answered Jul 11 '16 at 14:41

0

NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"XYZ" withExtension:@"momd"];

Make sure your data model name match with URLForResource:XYZ.

answered Jul 11 '16 at 14:41

garg

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score 0 · Answer 4 · answered Jan 03 '20 at 19:26

0

OK here's what I had to do. I had reverted by iOS version back to 9.x in order to run on an older iPad I have. This caused the error as prior versions must be case-sensitive in the bundle.

answered Jan 03 '20 at 19:26

Rick Schlueter

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10

score 0 · Answer 5 · answered Mar 13 '20 at 20:29

0

try "mom" instead of "momd"

NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"name" withExtension:@"mom"];

answered Mar 13 '20 at 20:29

codaman

206
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6

Your suggestion fixed my issue. Thanks. – Armin Sep 22 '20 at 10:35

score -2 · Answer 6 · edited Sep 28 '16 at 13:57

-2

I had the same error.

NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"name" withExtension:@"momd"];

"n" in name had to be "N": like everything else in obj c this mother is case sensitive.

edited Sep 28 '16 at 13:57

pacholik

8,607
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answered Sep 27 '16 at 14:14

Simone

37
3

"Cannot load NSManagedObjectModel. nil is an illegal URL parameter"

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