Crash log: http://paste.ubuntu.com/11752481/
Latest version build from source (commit 7ddf59d)

Same spot as #223

There where some missing @SideOnly(Side.CLIENT) annotations in the PneumaticCraft class, I've created a PR to fix this, we'll see what MineMaarten has to say.

PR has been merged, you'll have to use the next version of PneumaticCraft