[Lua][Error] Bios:338 error?

local function harvestTree()
	local count=0
	if turtle.detect()==true then
		turtle.dig()
		turtle.forward()
		turtle.digDown()
		turtle.select(2)
		turtle.placeDown()
		turtle.select(1)
		while turtle.detect() do
		  count=count+1
		  turtle.digUp()
		  turtle.up()
		end
		turtle.down(count)
	else
		print("No tree... Continuing")
		turtle.forward()
	end
end
		
local function checkTree()
	turtle.up(6)
	turtle.forward(4)
	turtle.turnLeft()
	turtle.forward()
	harvestTree()
	turtle.forward(2)
	harvestTree()
	turtle.turnRight()
	turtle.forward(2)
	harvestTree()
	turtle.turnRight()
	turtle.forward(2)
	harvestTree()
	turtle.turnLeft()
	turtle.forward(2)
	harvestTree()
	turtle.turnLeft()
	turtle.forward(2)
	harvestTree()
	turtle.turnRight()
	turtle.forward(2)
	harvestTree()
	turtle.turnRight()
	turtle.forward(2)
	harvestTree()
	turtle.foward(3)
	harvestTree()
	turtle.forward(2)
	harvestTree()
	turtle.turnRight()
	turtle.forward(2)
	harvestTree()
	turtle.turnRight()
	turtle.forward(2)
	harvestTree()
	turtle.turnLeft()
	turtle.forward(2)
	harvestTree()
	turtle.turnLeft()
	turtle.forward(2)
	harvestTree()
	turtle.turnRight()
	turtle.forward(2)
	harvestTree()
	turtle.turnRight()
	turtle.forward(2)
	harvestTree()
	turtle.forward(2)
	turtle.turnLeft()
	turtle.forward(4)
	turtle.down(6)
end
	
local function cycleCharcoal
	turtle.select(16)
	turtle.drop()
	turtle.suckUp()
	turtle.drop()
	turtle.suck()
	turtle.dropUp()
	turtle.select(1)
	end
	
local function takeCharcoal()
	turtle.select(16)
	turtle.suck()
		if turtle.getFuelLevel()< 100 then
			turtle.refuel(2)
		else
			print("No fuel needed")
		end
	turtle.select(1)
end
	
local function fillFurnace()
	turtle.select(3)
	for i=4, 16 do
		if turtle.compareTo(i)==true
			turtle.select(i)
			turtle.dropDown()
			turtle.select(3)
		else
			print("Not same")
		end
	end
	turtle.select(1)
end
		
local checkSaplings()
	turtle.select(2)
	turtle.suck()
	for i=3, 16 do
		if turtle.compareTo(i)==true
			turtle.select(i)
			turtle.drop()
			turtle.select(2)
		else
			print("Not same Saps")
		end
	end
	turtle.select(1)
end
	
local checkLogs()
	turtle.select(3)
	if turtle.getItemCout<3 then
		turtle.suckUp()
	else
		print("Enough logs")
	end
	for i=4, 16 do
		if turtle.compareTo(i)==true
			turtle.select(i)
			turtle.dropUp()
			turtle.select(3)
		else
			print("Not Logs")
		end
	end
	turtle.select(1)
end
	
local function furnaceCycle()
	turtle.forward()
	cycleCharcoal()
	turtle.back()
	turtle.up()
	takeCharcoal()
	turtle.up()
	turtle.forward()
	fillFurnace()
	checkSaplings()
	checkLogs()
	turtle.back()
	turtle.down(2)
	turtle.turnRight()
	turtle.turnRight()
end

--Main loop
	local checkTime=10
	local suckCount=0
	local suckTimer --=os.startTimer(1)
	local harvestTimer=os.startTimer(0)
	while true do
	
	  local e,p1,p2=os.pullEvent()
	  if e=="timer" and p1==harvestTimer then
		checkTrees()
		furnaceCycle()
		suckTimer=os.startTimer(1)
		suckCount=0
	  elseif e=="timer" and p1==suckTimer then
		turtle.suck()
		suckCount=suckCount+1
		if suckCount<60 then
		  suckTimer=os.startTimer(10)
		else
		  harvestTimer=os.startTimer(1)
		end
	  end	
	end