[Lua] problems with turtle code

This code is designed to make a small strip mine, 30 blocks in length and 2 blocks high. at the end of the tunnel that it makes, it will dig 3 blocks to the left, then come back making a new 30x2 block tunnel.
It is my first turtle code and I pieced it together from i class on visual basic and looking at other peoples' codes.

http://pastebin.com/mreEYeuT

I keep getting the error:
faux1:5: attempt to call nil

Capitalization matters. On that line, it should be "turtle.getFuelLevel()". It should also be "turtle.turnLeft()". The basic capitalization theme in CC is "apiname.someApiFunction()", so if you follow that when using functions, you should be good.

thanks everything seems to be working. I also had to change the turtle.digup() to turtle.digUp().