title: "Application windows are expected to have a root view controller at the end of application launch" error when running a project with Xcode 7, iOS 9
body: <p>After running function </p>
  
  <pre><code>- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
  </code></pre>
  
  <p>there is a crash:</p>
  
  <pre><code> Assertion failure in 
  -[UIApplication _runWithMainScene:transitionContext:completion:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-
  
   *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', `enter code here`reason: 'Application windows are expected to have a root view controller at the end of application launch'
  *** First throw call stack:
  (
      0   CoreFoundation                      0x0000000109377885 __exceptionPreprocess + 165
      1   libobjc.A.dylib                     0x0000000108df0df1 objc_exception_throw + 48
      2   CoreFoundation                      0x00000001093776ea +[NSException raise:format:arguments:] + 106
      3   Foundation                          0x0000000108a42bb1 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 198
      4   UIKit                               0x000000010760e350 -[UIApplication _runWithMainScene:transitionContext:completion:] + 2875
      5   UIKit                               0x000000010760b73f -[UIApplication workspaceDidEndTransaction:] + 188
      6   FrontBoardServices                  0x000000010b87fd7b FrontBoardServices + 163195
      7   FrontBoardServices                  0x000000010b880118 FrontBoardServices + 164120
      8   CoreFoundation                      0x00000001092a20f1 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
      9   CoreFoundation                      0x0000000109297eac __CFRunLoopDoSources0 + 556
      10  CoreFoundation                      0x0000000109297363 __CFRunLoopRun + 867
      11  CoreFoundation                      0x0000000109296d78 CFRunLoopRunSpecific + 488
      12  UIKit                               0x000000010760b091 -[UIApplication _run] + 402
      13  UIKit                               0x000000010760f79b UIApplicationMain + 171
      14  bbwc                                0x00000001037a9998 main + 344
      15  libdyld.dylib                       0x000000010a45ca05 libdyld.dylib + 10757
      16  ???                                 0x0000000000000001 0x0 + 1
  )
  libc++abi.dylib: terminating with uncaught exception of type NSException
  </code></pre>
  
  <p>This project is an old project, what should I do to make it build and run with Xcode 7 and iOS 9?</p>