title: Implementing Urban Airship(Android) Getting Null APID
body: <p>This is my first time ever using UA and I am trying to use push notifications. Except I keep getting a null APID. I am also getting an INVALID_USER error from GCM. Here is my code:</p>
  
  <pre><code>@Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.tab);
  
      AirshipConfigOptions options = AirshipConfigOptions.loadDefaultOptions(this);
      UAirship.takeOff(this.getApplication(), options);
      PushManager.enablePush();
  
      String apid = PushManager.shared().getAPID();
      Logger.info("My Application onCreate - App APID: " + apid);
  </code></pre>
  
  <p>Here is the null APID from the log:</p>
  
  <pre><code>06-30 19:38:29.118  15793-15793/us.bisonsoftware.tab I/Husky Athletics - UALib﹕ My Application onCreate - App APID: null
  </code></pre>
  
  <p>And here is the error for the GCM thing:</p>
  
  <pre><code>06-30 19:38:34.258  15793-16237/us.bisonsoftware.tab E/Husky Athletics - UALib﹕ Received   GCM error: INVALID_SENDER
  06-30 19:38:34.258  15793-16237/us.bisonsoftware.tab E/Husky Athletics - UALib﹕ Failed to register with GCM.
  06-30 19:38:34.258  15793-16237/us.bisonsoftware.tab E/Husky Athletics - UALib﹕ GCM Failure: INVALID_SENDER
  06-30 19:38:34.258  15793-16237/us.bisonsoftware.tab E/Husky Athletics - UALib﹕ Your GCM sender ID is invalid. Please check your AirshipConfig.
  </code></pre>
  
  <p>I know for the GCM thing it says to check the airship config but I'm not totally sure what the GCM sender ID is.  If anyone could help me with either of these problems it would be much appreciated. Please give details if you know what is wrong since I'm new to this, thanks.</p>