title: What is error: "NSInvalidArgumentException reason: Application tried to present modal view controller on itself
body: <p>When I try to run the app it crashes me 
  This is the message I get:</p>
  
  <pre><code>2014-07-25 14:40:28.116 X[13023:60b] (null)
  2014-07-25 14:40:29.113 X[13023:60b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Application tried to present modal view controller on itself. Presenting controller is &lt;GKHostedAuthenticateViewController: 0x10d625f90&gt;.'
  *** First throw call stack:
  (
      0   CoreFoundation                      0x00000001028a1495 __exceptionPreprocess + 165
      1   libobjc.A.dylib                     0x00000001024e399e objc_exception_throw + 43
      2   UIKit                               0x0000000101190cdc -[UIViewController presentViewController:withTransition:completion:] + 4100
      3   CoreFoundation                      0x0000000102896f1c __invoking___ + 140
      4   CoreFoundation                      0x0000000102896dc4 -[NSInvocation invoke] + 308
      5   UIKit                               0x0000000101181abc -[_UIDelayedPresentationContext finishDelayedPresentation:] + 201
      6   GameCenterUI                        0x000000010c97f330 __41-[GKRemoteViewController setupRemoteView]_block_invoke + 37
      7   CoreFoundation                      0x0000000102896f1c __invoking___ + 140
      8   CoreFoundation                      0x0000000102896dc4 -[NSInvocation invoke] + 308
      9   libdispatch.dylib                   0x000000010340a851 _dispatch_call_block_and_release + 12
      10  libdispatch.dylib                   0x000000010341d72d _dispatch_client_callout + 8
      11  libdispatch.dylib                   0x000000010340d3fc _dispatch_main_queue_callback_4CF + 354
      12  CoreFoundation                      0x00000001028ff289 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9
      13  CoreFoundation                      0x000000010284c854 __CFRunLoopRun + 1764
      14  CoreFoundation                      0x000000010284bd83 CFRunLoopRunSpecific + 467
      15  GraphicsServices                    0x0000000103efdf04 GSEventRunModal + 161
      16  UIKit                               0x0000000101090e33 UIApplicationMain + 1010
      17  X                              0x00000001000064c3 main + 115
      18  libdyld.dylib                       0x000000010366e5fd start + 1
  )
  libc++abi.dylib: terminating with uncaught exception of type NSException
  (lldb) 
  </code></pre>
  
  <p>What could be the problem? 
  Until now it worked well suddenly it happened 
  Thank you to all helpers</p>
  
  <p>update:
  @Sviatoslav Yakymiv
  found this i think</p>
  
  <pre><code>- (void)authenticateLocalUser {
  
  if (!gameCenterAvailable) return;
  
  
  GKLocalPlayer *localPlayer = [GKLocalPlayer localPlayer];
  if (SYSTEM_VERSION_LESS_THAN(@"6.0"))
  {
      // ios 5.x and below
      [localPlayer authenticateWithCompletionHandler:^(NSError *error)
       {
           [self checkLocalPlayer];
       }];
  }
  else
  {
      // ios 6.0 and above
      [localPlayer setAuthenticateHandler:(^(UIViewController* viewcontroller, NSError *error) {
          if (!error &amp;&amp; viewcontroller)
          {
              [viewcontroller presentViewController:viewcontroller animated:YES completion:nil];
          }
          else
          {
              [self checkLocalPlayer];
          }
      })];
  }
  </code></pre>
  
  <p>}</p>
  
  <p>What I can change it without a crash?
  thanks</p>