title: Watch app starts with error clientIdentifier for interfaceControllerID not found
body: <p>I'm having a smartwatch app on watchos2. The app always worked but now when it starts I immediately get this error:</p>
  
  <pre><code>Lop_WatchKit_Extension[17535:7854201] *********** ERROR -[SPRemoteInterface _interfaceControllerClientIDForControllerID:] clientIdentifier for interfaceControllerID:447E0002 not found
  </code></pre>
  
  <p>I found some topics here on stackoverflow but nothing solved the problem.</p>