NSInternalInconsistencyException ', raison:' Impossible de charger NIB en bundle: 'NSBundle

Dans mon AppDelegate, il y a un problème que je ne comprends pas. RootViewController initialement appelé ViewController et j'ai changé son nom. L'application est formée par de nombreux ViewController puis j'ai introduit un UINavigationController. Pourquoi cette erreur vient-elle?NSInternalInconsistencyException ', raison:' Impossible de charger NIB en bundle: 'NSBundle

NSInternalInconsistencyException', reason: 'Could not load NIB in bundle: 'NSBundle 
    /Users/XXXXXXXXXXXX/Library/Application Support/iPhone simulator/6.0/Applications/ 
    B7A7D461-1CFE-4B05-AF32-00B65FCFFF49/XXXXXXXXXX.app> (loaded)'with name 
'RootViewController'' 

    *** First throw call stack: 
    (0x1992012 0x1357e7e 0x1991deb 0x4bafac 0x37fe37 0x380418 0x380648 0x380882 0 
    x380b2a 0x397ef5 0x397fdb x398286 0x398381 0x398eab 0x398fc9 0x399055 0x49e3ab 
    0x2ef92d 0x136b6b0 0x1f12fc0 0x1f0733c 0x1f12eaf 0x38e8cd 0x2d71a6 0x2d5cbf 
    0x2d5bd9 0x2d4e34 0x2d4c6e 0x2d5a29 0x2d8922 0x382fec 0x2cfbc4 0x2cfdbf 
    0x2cff55 0x2d8f67 0x2b30 0x29c7b7 0x29cda7 0x29dfab 0x2af315 0x2b024b 0x2a1cf8 
    0x1dbedf9 0x1dbead0 0x1907bf5 0x1907962 0x1938bb6 0x1937f44 0x1937e1b 0x29d7da 
    0x29f65c 0x269d 0x25c5) 
    ibc++abi.dylib: terminate called throwing an exception 
    (lldb)

C'est le code dans AppDelegate.h

#import <UIKit/UIKit.h> 

    @class RootViewController; 

    @interface AppDelegate : UIResponder <UIApplicationDelegate>{ 

     UINavigationController *navigationController; 
    } 

    @property (strong, nonatomic) UIWindow *window; 

    @property (strong, nonatomic) RootViewController *viewController; 
    @property (strong, nonatomic) UINavigationController * navigationController; 



    @end

Voici le code de AppDelegate.m

#import "AppDelegate.h" 

    #import "RootViewController.h" 



    @implementation AppDelegate 

    @synthesize navigationController; 
    @synthesize viewController; 
    @synthesize window; 



    - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions: (NSDictionary *)launchOptions 
{ 
     self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; 
     // Override point for customization after application launch. 

     if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) { 
       self.viewController = [[RootViewController alloc]  initWithNibName:@"RootViewController_iPhone.xib" bundle:nil]; 
    } else { 
    self.viewController = [[RootViewController alloc] initWithNibName:@"RootViewController_iPad.xib" bundle:nil]; 
    } 

    RootViewController *rootMenu=[[RootViewController alloc]initWithNibName:@"RootViewController" bundle:nil]; 

    self.navigationController =[[UINavigationController alloc]initWithRootViewController:rootMenu]; 

    self.window.rootViewController = self.navigationController; 
    [self.window makeKeyAndVisible]; 
    return YES; 
}

Merci à l'avance

NSInternalInconsistencyException ', raison:' Impossible de charger NIB en bundle: 'NSBundle

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