Class scope variables cannot currently be initialized in class scope (I haven't tested with the latest version 0.6). You are most likely getting a null pointer error due to this, initialize that array in your Load() method.
I'm aware of the problem, and I've not had chance to fix it yet. I'm not quite sure why it's happening to be honest, but I'll do some troubleshooting. Fortunately there are workarounds for now though