title: Getting an error from push notification
body: <p>In my app, I need push notifications. I am implementing all the instructions from the push notifications docs. But I got an error from Push Notification:</p>
  
  <pre><code>Fail To Register For Remote Notifications With Error:
    Error Domain=NSCocoaErrorDomain Code=3000 "no valid 'aps-environment'
    entitlement string found for application" UserInfo=0x2340a0
    {NSLocalizedDescription=no valid 'aps-environment' entitlement string
    found for application}
  </code></pre>
  
  <p>What I am doing wrong?</p>