title: Android NotificationManager giving me "no valid small icon" error
body: <p>I am having a strange error with notification manager.</p>
  
  <pre><code>@Override
  public void onMessageReceived(String from, Bundle data)
  {
       Log.i(TAG, "IP : " + (String) data.get("ip"));
       NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
       Intent acceptNextIntent = new Intent(MainActivity.BROADCAST_KEY_ACCEPT);
  //        acceptNextIntent.putExtra("ip", (String) data.get("blah")); //add stuff here
       PendingIntent acceptNextPendingIntent = PendingIntent.getBroadcast(this, 0, acceptNextIntent, 0);
  
       Intent declineNextIntent = new Intent(MainActivity.BROADCAST_KEY_DECLINE);
       PendingIntent declineNextPendingIntent = PendingIntent.getBroadcast(this, 0, declineNextIntent, 0);
  
       NotificationCompat.Action acceptAction = new NotificationCompat.Action
                  .Builder(R.drawable.common_signin_btn_icon_disabled_focus_light, "Grant Request", acceptNextPendingIntent).build();
  
       NotificationCompat.Action declineAction = new NotificationCompat.Action
                  .Builder(R.drawable.common_signin_btn_icon_focus_dark, "Decline Request", declineNextPendingIntent).build();
  
       NotificationCompat.Builder notification = new NotificationCompat.Builder(this)
                  .setContentTitle("New Password Request From " + (String) data.get("ip"))
                  .addAction(acceptAction)
                  .addAction(declineAction);
  
       notificationManager.notify(1, notification.build()); //ERROR HERE
  </code></pre>
  
  <p>Error Message:</p>
  
  <pre><code>9.474 9327-9371/com.inh.amnesia_application I/MyGcmListenerService: IP : 128.239.213.39
  11-10 19:49:59.477 9327-9371/com.inh.amnesia_application E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
  11-10 19:49:59.477 9327-9371/com.inh.amnesia_application E/AndroidRuntime: Process: com.inh.amnesia_application, PID: 9327
  11-10 19:49:59.477 9327-9371/com.inh.amnesia_application E/AndroidRuntime: java.lang.IllegalArgumentException: Invalid notification (no valid small icon): Notification(pri=0 contentView=com.inh.amnesia_application/0x1090085 vibrate=null sound=null defaults=0x0 flags=0x0 color=0x00000000 actions=2 vis=PRIVATE)
  11-10 19:49:59.477 9327-9371/com.inh.amnesia_application E/AndroidRuntime:     at android.app.NotificationManager.notify(NotificationManager.java:222)
  11-10 19:49:59.477 9327-9371/com.inh.amnesia_application E/AndroidRuntime:     at android.app.NotificationManager.notify(NotificationManager.java:194)
  11-10 19:49:59.477 9327-9371/com.inh.amnesia_application E/AndroidRuntime:     at com.inh.amnesia_application.MyGcmListenerService.onMessageReceived(MyGcmListenerService.java:65)
  11-10 19:49:59.477 9327-9371/com.inh.amnesia_application E/AndroidRuntime:     at com.google.android.gms.gcm.GcmListenerService.zzt(Unknown Source)
  11-10 19:49:59.477 9327-9371/com.inh.amnesia_application E/AndroidRuntime:     at com.google.android.gms.gcm.GcmListenerService.zzk(Unknown Source)
  11-10 19:49:59.477 9327-9371/com.inh.amnesia_application E/AndroidRuntime:     at com.google.android.gms.gcm.GcmListenerService.zza(Unknown Source)
  11-10 19:49:59.477 9327-9371/com.inh.amnesia_application E/AndroidRuntime:     at com.google.android.gms.gcm.GcmListenerService$1.run(Unknown Source)
  11-10 19:49:59.477 9327-9371/com.inh.amnesia_application E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
  11-10 19:49:59.477 9327-9371/com.inh.amnesia_application E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
  11-10 19:49:59.477 9327-9371/com.inh.amnesia_application E/AndroidRuntime:     at java.lang.Thread.run(Thread.java:818)
  </code></pre>
  
  <p>Does this mean that the icons I am trying to access does not exist? I am not sure how to interpret this error and searching this error message does not yield anything.</p>