How to call growlnotify after a render completes?

I want to be able to receive push notifications to my iPhone when After Effects completes a render.

I used to use Prowl v1.5.2 & Growl v2.1.3 combined with this script (.jsx file)to do this, but I can't get the script to work now.

I can get growlnotify to send a notification from the terminal to Growl, and successfully pass it to Prowl on my iPhone, but when I tried this script, it fails at line 24. I've added the API key, and chosen growl as the notification type. Growlnotify is in usr/local/bin and my appname is set to Adobe After Effects CC 2015.

I don't need background rendering, just a simple notify when renders complete.

I'm using OSX 10.11.1 and iOS 9.2, and After Effects CC 2015 v13.6.0.165

So far I've managed to trigger the render to start, but can't get growlnotify to work:

app.project.renderQueue.render();

function(){system.callSystem(growlnotify)};