Drone Command program for PnuematicCraft

Found this code i would like to use for Drones in PniematicCraft but for some reason i cant pinpoint im getting ".temp:53: attempt to index? (a nil value)" any help would be appreciated greatly. Pastebin below.

Pastebin: http://pastebin.com/DyM3Mexc

That implies you're lacking the file containing the "button" API, which the script tries to load on line two. I would guess that this is the one you want.

hmm that would be helpful I think ill have to rewrite it to fit the drone program but ill see if it helps any.