I was transferring my latest creation over to my hosted Ubuntu server and came across the most annoying error. I had to reinstall the NodePie module because it relies on compiled C code. I kept getting an error though about something called lib-expat.
Anyhow, turns out you need to apt-get a new library:
sudo apt-get install libexpat1-dev
GitHub to the rescue:https://github.com/astro/node-xmpp/issues/33