Facebook sdk 3.5 Fehler “com.facebook.sdk:ErrorLoginFailedReason"

Ich bin mit der Facebook SDK 3.5, während die Anmeldung ich bin immer folgende Fehlermeldung:

Hier ist die code, die ich benutze für facebook login

- (BOOL)openSession:(BOOL)allowLogin
  {  
    NSArray *permissions = [NSArray arrayWithObjects:@"user_photos",@"email",@"user_location",@"offline_access", nil];
    return [FBSession openActiveSessionWithReadPermissions:permissions
          allowLoginUI:allowLogin
          completionHandler:^(FBSession *session1,
                              FBSessionState state,
                              NSError *error) {[
                                  self sessionStateChanged:session1 state:state error:error];
                                     }];  
  }

 - (void)sessionStateChanged:(FBSession *)session  state:(FBSessionState)state  error:(NSError *)error
   {        
     switch (state) {            
       case FBSessionStateOpen:
        {

        }
       break;

       case FBSessionStateClosed:            
       case FBSessionStateClosedLoginFailed:
        {
          [[FBSession activeSession] closeAndClearTokenInformation];  
        }
       break;       

       default:
       break;            
      }

    if (error) {
       UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Error"   message:error.localizedDescription delegate:nil  cancelButtonTitle:@"OK"  otherButtonTitles:nil];
       [alertView show];
       [alertView release];
       }
   }

Fehler

Domain=com.facebook.sdk 
Code=2 "The operation couldn’t be completed. (com.facebook.sdk error 2.)" 
UserInfo=0x1e0a3080 
  {
    com.facebook.sdk:ErrorLoginFailedReason=com.facebook.sdk:SystemLoginCancelled, 
    com.facebook.sdk:ErrorInnerErrorKey=Error 
    Domain=com.apple.accounts 
    Code=7 "The operation couldn’t be completed. (com.apple.accounts error 7.)",   
    com.facebook.sdk:ErrorSessionKey=<FBSession: 0x1d5d69d0,
    state: FBSessionStateClosedLoginFailed,
    loginHandler: 0x0, 
    appID: 205008289575045, 
    urlSchemeSuffix: , 
    tokenCachingStrategy:<FBSessionTokenCachingStrategy: 0x1e033950>,
    expirationDate: (null), 
    refreshDate: (null),
    attemptedRefreshDate: 0001-12-30 00:00:00 +0000, permissions:(null)>
   }

Jede mögliche Hilfe würde geschätzt.