Fir Tree progam used by sethbling not working?!

Title: Fir Tree progam used by sethbling not working?!

I've copyed it, it was working before destroyed my turtle by mistake, re-written it and now its saying an
bios:338: [string "fell"]:9: '('

code

local function checkFuel()
  if turtle.getFuelLevel() < 1 then
turtle.select(1)
turtle.refuel(1)
  end
end
local function column()
  while turtle.digUp() do
turtle.dig()
checkFuel()
turtle.up()
  end
  turtle.dig()
  checkFuel()
  while turtle.down() do
checkFuel()
  end
end
local function digmove()
  checkFuel()
  turtle.dig()
  turtle.forward()
end
digmove()
column()
turtle.turnRight()
digmove()
turtle.turnLeft()
column()
turtle.turnLeft()
digmove()
digmove()
turtle.turnRight()
column()

Could you open fell using "edit fell" on your turtle, go to line 9, and paste that line exactly as it appears on your turtle?

Did you copy the code or re-write it here too?