title: (Simulator iPhone 4s is not available.) during validation
body: <p>I try to update my pod to <strong>Xcode 8</strong> and <strong>Swift 3</strong> syntax, I did run the following command of my project:</p>
  
  <pre><code>pod spec lint BSTableViewReorder.podspec
  </code></pre>
  
  <p>and it produces an error:</p>
  
  <pre>
   -> BSTableViewReorder (1.3)
      - ERROR | [iOS] unknown: Encountered an unknown error (/Applications/Xcode.app/Contents/Developer/usr/bin/xcrun simctl list devices
  
  2016-08-25 11:58:10.561 simctl[34169:531955] CoreSimulator is attempting to unload a stale CoreSimulatorService job.  Detected Xcode.app relocation or CoreSimulatorService version change.  Framework path (/Applications/Xcode.app/Contents/Developer/Library/PrivateFrameworks/CoreSimulator.framework) and version (209.19) does not match existing job path (/Users/kuna/Downloads/Xcode-beta.app/Contents/Developer/Library/PrivateFrameworks/CoreSimulator.framework/Versions/A/XPCServices/com.apple.CoreSimulator.CoreSimulatorService.xpc/Contents/MacOS/com.apple.CoreSimulator.CoreSimulatorService) and version (303.7).
  2016-08-25 11:58:10.819 simctl[34169:531955] Failed to locate a valid instance of CoreSimulatorService in the bootstrap.  Adding it now.
  2016-08-25 11:58:10.839 simctl[34169:531955] *** Assertion failure in -[SimServiceContext reloadServiceIfMovedOrAbortIfWeAreInvalid], /BuildRoot/Library/Caches/com.apple.xbs/Sources/CoreSimulator/CoreSimulator-209.19/CoreSimulator/SimServiceContext.m:536
  2016-08-25 11:58:10.857 simctl[34169:531955] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'The loaded com.apple.CoreSimulator.CoreSimulatorService job does not match our expectations: pathOfLoadedJob: /Users/kuna/Downloads/Xcode-beta.app/Contents/Developer/Library/PrivateFrameworks/CoreSimulator.framework/Versions/A/XPCServices/com.apple.CoreSimulator.CoreSimulatorService.xpc/Contents/MacOS/com.apple.CoreSimulator.CoreSimulatorService, our frameworkPath: /Applications/Xcode.app/Contents/Developer/Library/PrivateFrameworks/CoreSimulator.framework'
  *** First throw call stack:
  (
      0   CoreFoundation                      0x00007fff87a934f2 __exceptionPreprocess + 178
      1   libobjc.A.dylib                     0x00007fff93c8973c objc_exception_throw + 48
      2   CoreFoundation                      0x00007fff87a981ca +[NSException raise:format:arguments:] + 106
      3   Foundation                          0x00007fff8aaa8856 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 198
      4   CoreSimulator                       0x00000001099953e9 -[SimServiceContext reloadServiceIfMovedOrAbortIfWeAreInvalid] + 1313
      5   CoreSimulator                       0x0000000109995d01 -[SimServiceContext connect] + 41
      6   CoreSimulator                       0x00000001099947a6 -[SimServiceContext initWithDeveloperDir:connectionType:] + 1108
      7   CoreSimulator                       0x0000000109994071 __63+[SimServiceContext sharedServiceContextForDeveloperDir:error:]_block_invoke_2 + 127
      8   libdispatch.dylib                   0x00007fff923fb40b _dispatch_client_callout + 8
      9   libdispatch.dylib                   0x00007fff923fc9f2 _dispatch_barrier_sync_f_invoke + 74
      10  CoreSimulator                       0x0000000109993ea6 +[SimServiceContext sharedServiceContextForDeveloperDir:error:] + 226
      11  CoreSimulator                       0x00000001099941ee +[SimServiceContext sharedServiceContext] + 51
      12  simctl                              0x0000000109982a71 simctl + 31345
      13  libdyld.dylib                       0x00007fff95ba65ad start + 1
      14  ???                                 0x0000000000000003 0x0 + 3
  )
  libc++abi.dylib: terminating with uncaught exception of type NSException
  ) during validation.
  </pre>
  
  <p><strong>UPDATE:</strong>
  After I chnaged the name of my Xcode from <code>Xcode beta</code> to <code>Xcode</code>, the following error arise:</p>
  
  <blockquote>
    <p>Encountered an unknown error (Simulator iPhone 4s is not available.) during validation.</p>
  </blockquote>
  
  <p>How to fix this?</p>