Alright, I've made a custom furnace before (but this was a while back) and what not, worked, yay, so I came back and decided to do something a little more complicated - only this time, two errors decide they want to exist (I did copy and paste the code from https://github.com/NealeGaming/nealecraft to save time).
This is the first error, in the BlockHydrogenSeparator code.
Here's the code for it: http://pastebin.com/gWMN5zzG (BlockHydrogenSeparator class)
Second error lies within this class, GuiHydrogenSeparator.
Here's the error: http://puu.sh/aJGZA/cef74319c3.png
Here's the code: http://pastebin.com/wyk5i2id
For reference, here's the container, tile entity and guihandler code:
Container class: http://pastebin.com/KxJEsdrc
Tile Entity class: http://pastebin.com/weQpWhE7
GuiHandler class: http://pastebin.com/nWf1JF1B
Any and all help is appreciated, thanks.