title: this class is not key value coding-compliant for the key XXXXXX
body: <p>when i try to build and run my app, it crashes and i got this in the log :</p>
  
  <pre><code>reason: '[&lt;LoadingViewController 0x6b2c5a0&gt; setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key aproposViewController.'
  </code></pre>
  
  <p>the strange is that <code>aproposViewController</code> is not used in <code>LoadingViewController</code>, it's just another view controller in my app. please help, thx in advance :)</p>
  
  <p><strong>EDIT</strong></p>
  
  <p><strong>appdelegate.h :</strong></p>
  
  <pre><code>@class LoadingViewController;
  
  @interface TopStationAppDelegate : NSObject &lt;UIApplicationDelegate,CLLocationManagerDelegate&gt; {
      UIWindow *window;
      LoadingViewController *loadingView;
  }
  @property (nonatomic, retain) IBOutlet UIWindow *window;
  @property (nonatomic, retain) IBOutlet LoadingViewController *loadingView;
  @end
  </code></pre>
  
  <p><strong>appdelegate.m</strong> :</p>
  
  <pre><code>#import "LoadingViewController.h"
  @implementation TopStationAppDelegate
  @synthesize window;
  @synthesize loadingView;
  - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    
    [window addSubview:loadingView.view];
      [window makeKeyAndVisible];
      return YES;
  }
  - (void)dealloc {
      [loadingView release];
      [window release];
      [super dealloc];
  }
  @end
  </code></pre>
  
  <p>there is no declaration of aproposViwController, even in IB for the main view !!
  <strong>EDIT 2</strong>
  here two screenshot of my besic set in the main and loadingView in interface builder :
  <img src="https://i.stack.imgur.com/d9lRX.png" alt="enter image description here"> </p>
  
  <p><img src="https://i.stack.imgur.com/zZMYP.png" alt="enter image description here"></p>