title: Xcode 10 watch kit and watch extension build error
body: <p>I have 3 targets, including the main target, WatchKit app and WatchKit extension.<br/>
  The project doesn't have any build error in Xcode 9.2 but when I build it in Xcode 10 it has these error:</p>
  
  <blockquote>
    <p>unable to resolve product type
    'com.apple.product-type.application.watchapp' for platform 'watchos'</p>
    
    <p>unable to resolve product type
    'com.apple.product-type.watchkit-extension' for platform 'watchos'</p>
  </blockquote>
  
  <p>I set the "supported platforms" and "base sdk" to watchOS, for both watchapp and extension. but it did not fix this issue.<br/></p>
  
  <blockquote>
    <p>also I can mention that my app cannot run in watchOS 5.<br/><br/>
     The developer of this app needs to update it to work with watchOS 5</p>
  </blockquote>