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POCannot create an NSPersistentStoreCoordinator with a nil model
 

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    <p>Been having my first crack at Core Data and I'm getting the following error when running my code on my device, but it works fine on the simulator..</p> <blockquote> <p><em>*</em> Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Cannot create an NSPersistentStoreCoordinator with a nil model'</p> </blockquote> <p>Some of my methods that might be causing the problem:</p> <pre><code> - (NSManagedObjectContext *)managedObjectContext { if (__managedObjectContext != nil) { return __managedObjectContext; } NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator]; if (coordinator != nil) { __managedObjectContext = [[NSManagedObjectContext alloc] init]; [__managedObjectContext setPersistentStoreCoordinator:coordinator]; } return __managedObjectContext; } /** Returns the managed object model for the application. If the model doesn't already exist, it is created from the application's model. */ - (NSManagedObjectModel *)managedObjectModel { if (__managedObjectModel != nil) { return __managedObjectModel; } NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"RugbyOnTv" withExtension:@"momd"]; __managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL]; return __managedObjectModel; } /** Returns the persistent store coordinator for the application. If the coordinator doesn't already exist, it is created and the application's store added to it. */ - (NSPersistentStoreCoordinator *)persistentStoreCoordinator { if (__persistentStoreCoordinator != nil) { return __persistentStoreCoordinator; } NSString *storePath = [[self applicationDocumentsDirectory] stringByAppendingPathComponent: @"RugbyOnTV.sqlite"]; NSURL *storeUrl = [NSURL fileURLWithPath:storePath]; NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption, [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, nil]; __persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: [self managedObjectModel]]; NSError *error = nil; __persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]]; if (![__persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeUrl options:options error:&amp;error]) { NSLog(@"Unresolved error %@, %@", error, [error userInfo]); abort(); } return __persistentStoreCoordinator; } - (NSString *)applicationDocumentsDirectory { NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *basePath = ([paths count] &gt; 0) ? [paths objectAtIndex:0] : nil; return basePath; } </code></pre> <p><strong>EDIT</strong></p> <p>I copied and pasted the managedObjectContext method (below) from Apple's CoreDataBooks and it now works..Not really sure why though</p> <pre><code>- (NSManagedObjectModel *)managedObjectModel { if (managedObjectModel != nil) { return managedObjectModel; } managedObjectModel = [[NSManagedObjectModel mergedModelFromBundles:nil] retain]; return managedObjectModel; } </code></pre>
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    1. USDominic Williams
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    1. COHey it could be as simple as appending the word "Model" to the first URLForResource parameter....yeah, I had the same problem. Then I checked the actual .app contents in the command line and found out that the .momd was actually being created. So try this: [[NSBundle mainBundle] URLForResource:@"RugbyOnTvModel" withExtension:@"momd"];
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