title: Crash on Apple Review - iOS
body: <p>I had submit application several time to review.
  But every time Apple tester said the application crash.
  I test on my application in environment IPV4. 
  Totally no crash, but Apple tester said crash when launch as below.
  It's the problem about IPV6? I can't test in environment IPV6.</p>
  
  <blockquote>
    <p>Thank you for your resubmission. We were unable to review your app as
    it crashed on launch. We have attached detailed crash logs to help
    troubleshoot this issue.</p>
    
    <p>Steps to reproduce:</p>
    
    <p>1) Start the app on a device 2) the app attempts to launch and crashes</p>
    
    <p>Next Steps</p>
    
    <p>Please revise your app and test it on a device while connected to an
    IPv6 network (all apps must support IPv6) to ensure it will launch
    without crashing.</p>
  </blockquote>
  
  <pre><code>Date/Time:           2016-10-25 13:02:41.6759 -0700
  Launch Time:         2016-10-25 13:02:40.6012 -0700
  OS Version:          iPhone OS 10.0.2 (14A456)
  Report Version:      104
  
  Exception Type:  EXC_BREAKPOINT (SIGTRAP)
  Exception Codes: 0x0000000000000001, 0x000000010014c3fc
  Termination Signal: Trace/BPT trap: 5
  Termination Reason: Namespace SIGNAL, Code 0x5
  Terminating Process: exc handler [0]
  Triggered by Thread:  0
  
  Filtered syslog:
  None found
  
  Thread 0 name:  Dispatch queue: com.apple.main-thread
  Thread 0 Crashed:
  0   BBBApps                         0x000000010014c3fc 0x1000e4000 + 427004
  1   BBBApps                         0x0000000100149420 0x1000e4000 + 414752
  2   UIKit                           0x000000018d0a342c 0x18d021000 + 533548
  3   UIKit                           0x000000018d2b3b70 0x18d021000 + 2698096
  4   UIKit                           0x000000018d2b98e0 0x18d021000 + 2722016
  5   UIKit                           0x000000018d2ce080 0x18d021000 + 2805888
  6   UIKit                           0x000000018d2b68c4 0x18d021000 + 2709700
  7   FrontBoardServices              0x0000000188d898bc 0x188d4f000 + 239804
  8   FrontBoardServices              0x0000000188d89728 0x188d4f000 + 239400
  9   FrontBoardServices              0x0000000188d89ad0 0x188d4f000 + 240336
  10  CoreFoundation                  0x0000000187196278 0x1870b9000 + 905848
  11  CoreFoundation                  0x0000000187195bc0 0x1870b9000 + 904128
  12  CoreFoundation                  0x00000001871937c0 0x1870b9000 + 894912
  13  CoreFoundation                  0x00000001870c2048 0x1870b9000 + 36936
  14  UIKit                           0x000000018d09c5dc 0x18d021000 + 505308
  15  UIKit                           0x000000018d097360 0x18d021000 + 484192
  16  BBBApps                         0x00000001000ea5e4 0x1000e4000 + 26084
  17  libdyld.dylib                   0x00000001860a45b8 0x1860a0000 + 17848
  </code></pre>
  
  <p>Here the crash report from Crashlytics:</p>
  
  <pre><code>#0. Crashed: com.apple.main-thread
  0  BBBApps                       0x10009183c specialized AppDelegate.application(UIApplication, didFinishLaunchingWithOptions : [NSObject : AnyObject]?) -&gt; Bool (AppDelegate.swift:39)
  1  BBBApps                       0x10008ecbc @objc AppDelegate.application(UIApplication, didFinishLaunchingWithOptions : [NSObject : AnyObject]?) -&gt; Bool (AppDelegate.swift)
  2  UIKit                          0x19235b42c -[UIApplication _handleDelegateCallbacksWithOptions:isSuspended:restoreState:] + 400
  3  UIKit                          0x19256bb70 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 3524
  4  UIKit                          0x1925718e0 -[UIApplication _runWithMainScene:transitionContext:completion:] + 1656
  5  UIKit                          0x192586080 __84-[UIApplication _handleApplicationActivationWithScene:transitionContext:completion:]_block_invoke.3134 + 48
  6  UIKit                          0x19256e8c4 -[UIApplication workspaceDidEndTransaction:] + 168
  7  FrontBoardServices             0x18e0418bc __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 36
  8  FrontBoardServices             0x18e041728 -[FBSSerialQueue _performNext] + 176
  9  FrontBoardServices             0x18e041ad0 -[FBSSerialQueue _performNextFromRunLoopSource] + 56
  10 CoreFoundation                 0x18c44e278 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24
  11 CoreFoundation                 0x18c44dbc0 __CFRunLoopDoSources0 + 524
  12 CoreFoundation                 0x18c44b7c0 __CFRunLoopRun + 804
  13 CoreFoundation                 0x18c37a048 CFRunLoopRunSpecific + 444
  14 UIKit                          0x1923545dc -[UIApplication _run] + 608
  15 UIKit                          0x19234f360 UIApplicationMain + 208
  16 BBBApps                       0x10008f9d4 main (AppDelegate.swift:17)
  17 libdispatch.dylib              0x18b35c5b8 (Missing)
  </code></pre>