Error

local location = ""

function teleport()
   tp = peripheral.wrap("bottom")
   tp.teleport()
end

function checkFull()
   greader = peripheral.wrap("right")
   data = greader.get()
   while not data["Full Energy"] do
      sleep(2)
      data=greader.get()
   end
   turtle.dig()
end

function checkEmpty()
   greader=peripheral.wrap("right")
   data = greader.get()
   while not data["No Energy"] do
      sleep(2)
      data = greader.get()
   end
   turtle.dig()
end

function checkLoc()
   loc = turtle.detectUp()
   if loc == true then
      print("I am at the quarry")
      location = "Quarry"
      if turtle.getItemCount(1) > 0 then turtle.turnRight() end
   else
      print("I am at the charge station")
      location = "Charging"
      if turtle.getItemCount(1) > 0 then
         turtle.turnRight()
         turtle.forward()
         turtle.forward()
      end
   end
end

function getFuel()
   turtle.turnRight()
for i = 1, 9 do turtle.forward() end
   turtle.turnLeft()
for i = 1, 6 do turtle.forward() end
   turtle.suck()
   turtle.refuel()
   turtle.turnLeft()
   turtle.turnLeft()
for i = 1, 6 do turtle.forward() end
   turtle.turnRight()
for i = 1, 9 do turtle.forward() end
   turtle.turnRight()
  end


function checkFuel()
   fuel = turtle.getFuelLevel()
   print("My fuel level:"..tostring(fuel))
   if fuel < 1000 then
      print("I need fuel")
      getFuel()
      print("My fuel level:"..tostring(turtle.getFuelLevel()))
   end
end


checkLoc()
if location == "Quarry" then
   turtle.place()
   checkEmpty()
   teleport()
else
   turtle.place()
   checkFuel()
   checkFull()
   turtle.turnLeft()
   turtle.turnLeft()
   turtle.forward()
   turtle.forward()
   teleport()
end