title: How to use coredata from iPhone on AppleWatch OS2?
body: <p>I tried send it by fileTransfer method:</p>
  
  <pre><code>let modelURL = NSBundle.mainBundle().URLForResource("my_app", withExtension: "momd")!
  
  WCSession.defaultSession().transferFile(modelURL, metadata:nil)
  </code></pre>
  
  <p>but I get error:</p>
  
  <blockquote>
    <p>Optional(Error Domain=WCErrorDomain Code=7008 "Invalid parameter passed to WatchConnectivity API." UserInfo={NSLocalizedDescription=Invalid parameter passed to WatchConnectivity API., NSLocalizedRecoverySuggestion=Only pass parameters of correct type.})</p>
  </blockquote>
  
  <p>Do you have any idea how to sync CoreData between iPhone and WatchOS2?</p>