title: react-native run-ios doesn't run: Application is unknown to FrontBoard?
body: <p>I had <code>react-native run-ios</code> working for the past few days but today it randomly decided to stop working:</p>
  
  <hr>
  
  <pre><code>The following commands produced analyzer issues:
      Analyze /Users/swyx/Desktop/webdev/fullstacksr/reactNativeExtensions/ActionExtensionExample3/node_modules/react-native/ReactCommon/yoga/yoga/YGNodeList.c
      Analyze /Users/swyx/Desktop/webdev/fullstacksr/reactNativeExtensions/ActionExtensionExample3/node_modules/react-native/ReactCommon/yoga/yoga/Yoga.c
  (2 commands with analyzer issues)
  
  Installing build/Build/Products/Debug-iphonesimulator/ActionExtensionExample3.app
  An error was encountered processing the command (domain=IXErrorDomain, code=2):
  Failed to set plugin placeholders for org.reactjs.native.example.ShareExtensionExampleswyx
  Launching org.reactjs.native.example.ShareExtensionExampleswyx
  org.reactjs.native.example.ShareExtensionExampleswyx: -1
  An error was encountered processing the command (domain=FBSOpenApplicationServiceErrorDomain, code=1):
  The request to open "org.reactjs.native.example.ShareExtensionExampleswyx" failed.
  The request was denied by service delegate (SBMainWorkspace) for reason: NotFound ("Application "org.reactjs.native.example.ShareExtensionExampleswyx" is unknown to FrontBoard").
  </code></pre>
  
  <hr>
  
  <p>Possible causes and solutions investigated:</p>
  
  <ul>
  <li><a href="https://stackoverflow.com/questions/37939749/xcode-8-messages-template-application-error-on-ios-simulator">Checking the scheme</a> - it is definitely <code>Ask on launch</code></li>
  <li><a href="https://stackoverflow.com/questions/39645824/the-request-was-denied-by-service-delegate-sbmainworkspace">Scheme settings</a> - i dont have any empty settings to leave unchecked</li>
  <li>Maximum App ID limit reached - this app id <code>org.reactjs.native.example.ShareExtensionExampleswyx</code> is something I am reusing but i dont think it causes this issue</li>
  <li>deleting <code>ios/build</code> and recompiling</li>
  <li>restarting my simulator and my entire computer</li>
  <li>Edit: yes i am using xcode 9</li>
  </ul>
  
  <p>none of these have worked so far. Any other ideas on things to try please?</p>