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I am trying to build my app and at one point I push a UIViewController and then I get this error. I am not exactly sure why. 'UIViewControllerHierarchyInconsistency', reason: 'A view can only be associated with at most one view controller at a time! View > is associated with . Clear this association before associating this view with .' PageViewController *viewController; viewController = [[PageViewController alloc] initWithManagedObjectContext:managedObjectContext]; dataSource = [[PagesDataSource alloc] initWithManagedObjectContext:managedObjectContext]; PVPage *selectedPage = [[dataSource pages] objectAtIndex:itemIndex]; [viewController setRepresentedPage:selectedPage]; PageFlipperAppDelegate *appDelegate = (PageFlipperAppDelegate *)[[UIApplication sharedApplication] delegate]; [(UINavigationController *)[[appDelegate window] rootViewController] setToolbarHidden:YES animated:YES]; [(UINavigationController *)[[appDelegate window] rootViewController] pushViewController:viewController animated:YES]; In my pageViewController................... - (id)initWithManagedObjectContext:(NSManagedObjectContext *)initManagedObjectContext { if ((self = [super initWithNibName:@"PageView" bundle:nil])) { [self setManagedObjectContext:initManagedObjectContext]; dataSource = [[PagesDataSource alloc] initWithManagedObjectContext:[self managedObjectContext]]; } return self; }

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