title: FBSDKAppEvents.activateApp() unrecognized selector sent to instance
body: <p>I'm trying to integrate facebook sdk in my app, I have completed all the info.plist and importing sdk steps. When ever I run my app, when first viewloads I'm getting this error </p>
  
  <pre><code>    2015-04-04 21:09:43.105 TestFBApp[1468:27977] -[__NSCFNumber length]: unrecognized selector sent to instance 0xb0513d5e52c2fe43
  2015-04-04 21:09:43.173 TestFBApp[1468:27977] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFNumber length]: unrecognized selector sent to instance 0xb0513d5e52c2fe43'
  *** First throw call stack:
  (
      0   CoreFoundation                      0x0000000103e55a75 __exceptionPreprocess + 165
      1   libobjc.A.dylib                     0x0000000105e5ebb7 objc_exception_throw + 45
      2   CoreFoundation                      0x0000000103e5cd1d -[NSObject(NSObject) doesNotRecognizeSelector:] + 205
      3   CoreFoundation                      0x0000000103db49dc ___forwarding___ + 988
      4   CoreFoundation                      0x0000000103db4578 _CF_forwarding_prep_0 + 120
      5   TestFBApp                           0x00000001036fbe9c +[FBSDKGraphRequestPiggybackManager addPiggybackRequests:] + 108
      6   TestFBApp                           0x000000010371a165 -[FBSDKGraphRequestConnection start] + 231
      7   TestFBApp                           0x00000001036fdb9a +[FBSDKServerConfigurationManager _loadServerConfigurationFromServerForAppID:] + 236
      8   TestFBApp                           0x00000001036fda97 +[FBSDKServerConfigurationManager _loadServerConfigurationForAppID:] + 252
      9   TestFBApp                           0x00000001036fce28 +[FBSDKServerConfigurationManager loadServerConfigurationWithCompletionBlock:] + 319
      10  TestFBApp                           0x000000010372d663 -[FBSDKLoginTooltipView presentInView:withArrowPosition:direction:] + 260
      11  TestFBApp                           0x000000010372ecf5 -[FBSDKTooltipView presentFromView:] + 968
      12  TestFBApp                           0x00000001037274a4 -[FBSDKLoginButton _showTooltipIfNeeded] + 225
      13  Foundation                          0x00000001044d02e5 __NSFireDelayedPerform + 387
      14  CoreFoundation                      0x0000000103dbd6c4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 20
      15  CoreFoundation                      0x0000000103dbd285 __CFRunLoopDoTimer + 1045
      16  CoreFoundation                      0x0000000103d8059d __CFRunLoopRun + 1901
      17  CoreFoundation                      0x0000000103d7fbc6 CFRunLoopRunSpecific + 470
      18  GraphicsServices                    0x0000000107874a58 GSEventRunModal + 161
      19  UIKit                               0x0000000104b99580 UIApplicationMain + 1282
      20  TestFBApp                           0x00000001036c6c0e top_level_code + 78
      21  TestFBApp                           0x00000001036c6c4a main + 42
      22  libdyld.dylib                       0x000000010855e145 start + 1
      23  ???                                 0x0000000000000001 0x0 + 1
  )
  libc++abi.dylib: terminating with uncaught exception of type NSException
  </code></pre>
  
  <p>This is my appdelegate.swift</p>
  
  <pre><code>import UIKit
  
  @UIApplicationMain
  class AppDelegate: UIResponder, UIApplicationDelegate {
  
      var window: UIWindow?
  
  
      func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -&gt; Bool {
          // Override point for customization after application launch.                
  
          return FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)
      }
  
      func application(application: UIApplication, openURL url: NSURL, sourceApplication: NSString?, annotation: AnyObject) -&gt; Bool {
          return FBSDKApplicationDelegate.sharedInstance().application(application, openURL: url, sourceApplication: sourceApplication, annotation: annotation)
      }
  
  
  
      func applicationWillResignActive(application: UIApplication) {
  
      }
  
      func applicationDidEnterBackground(application: UIApplication) {
  
      }
  
      func applicationWillEnterForeground(application: UIApplication) {
          // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
      }
  
      func applicationDidBecomeActive(application: UIApplication) {
          // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
  
          FBSDKAppEvents.activateApp()
      }
  
      func applicationWillTerminate(application: UIApplication) {
          // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
      }
  
  
  }
  </code></pre>
  
  <p>When i remove <strong>FBSDKAppEvents.activateApp()</strong> It works fine. </p>