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POError: nil is not a legal NSManagedObjectContext
 

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    <p>I have checked some other threads but can't find an answer.</p> <p>I am following a tutorial on Core Data and I am trying to apply it to my utility app.</p> <p>The following code is in the application delegate: </p> <pre><code>- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions: (NSDictionary *)launchOptions { NSManagedObjectContext *context = [self managedObjectContext]; MessageDetails *messageDetails = [NSEntityDescription insertNewObjectForEntityForName:@"MessageDetails" inManagedObjectContext:context]; messageDetails.to = @"0861234567"; messageDetails.message = @"Test Message"; NSError *error; if (![context save:&amp;error]) { NSLog(@"Whoops, couldn't save: %@", [error localizedDescription]); } //Lists out all the objects currently in the database: NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"MessageDetails" inManagedObjectContext:context]; [fetchRequest setEntity:entity]; NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:&amp;error]; for (MessageDetails *details in fetchedObjects) { NSLog(@"To: %@", details.to); NSLog(@"Message: %@", details.message); } // Override point for customization after application launch. CCCMainViewController *controller = (CCCMainViewController *)self.window.rootViewController; controller.managedObjectContext = self.managedObjectContext; return YES; } </code></pre> <p>My flipside view controller has the following code</p> <pre><code>- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"MessageDetails" inManagedObjectContext:managedObjectContext]; [fetchRequest setEntity:entity]; NSError *error; self.allMessageDetails = [managedObjectContext executeFetchRequest:fetchRequest error:&amp;error]; } </code></pre> <p>I am getting the following error:</p> <pre><code>2013-09-25 02:09:11.238 SendMessageV2[9267:60b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+entityForName: nil is not a legal NSManagedObjectContext parameter searching for entity name 'MessageDetails'' *** First throw call stack: (0x301fdf53 0x3a5d46af 0x2ff5332b 0x25345 0x32973603 0x329733c1 0x32a1d637 0x32a59d7b 0x32a586b3 0x32a57705 0x32c3265b 0x329a3f3f 0x329a3edf 0x329a3eb9 0x3298fb3f 0x329a392f 0x329a3601 0x3299e68d 0x32973a25 0x32972221 0x301c918b 0x301c865b 0x301c6e4f 0x30131ce7 0x30131acb 0x34e52283 0x329d3a41 0x23cc9 0x3aadcab7) libc++abi.dylib: terminating with uncaught exception of type NSException (lldb) </code></pre> <p>It is something to do with the flipside view controller.m file where the managed object context is coming up as nil. I do not understand why this is. Any help would be greatly appreciated.</p> <p>Cheers.</p>
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