Computercraft help

[ClubSeal]

Hi guys, relatively new to computercraft, I'm trying to make a turtle program that mines out a room of specific dimensions, and I'm getting an attempt to call nil error that I can't work out. Any help or tips are appreciated.
pastebin is http://pastebin.com/zLUwFEZP

Apologies if I posted this to the wrong spot.

 

[trajing]

It should tell you a value which will be the line that the error is on, could you tell us exactly what it says when you try to run it?

 

[ratchet freak]

it's turtle.turnLeft() and turtle.turnRight() instead of left and right

 

[ClubSeal]

That fixed it, thanks for the replies guys, and yeah sorry trajing, I'll remember to do that in the future.