skos:66: attempt to call nil

slc = 0
dbc = 1
tbbc = 2048
tbtc = 16384
tbbuc = 8192
function drawTitleBar()
  term.setCursorPos(1,1)
  term.setBackgroundColor(tbbc)
  term.setTextColor(tbtc)
  term.clearLine()
  term.setBackgroundColor(tbbuc)
  print("System")
end
function drawDesktop()
  term.setBackgroundColor(dbc)
  term.clear()
  dpic = paintutils.loadImage("SporreKing/sk-os/desktop")
  djpic = paintutils.loadImage("SporreKing/sk-os/play")
  paintutils.drawImage(dpic,-7,1)
  term.setCursorPos(0,0)
  drawTitleBar()
  paintutils.drawImage(djpic,-12,1)
end
function drawSystem()
  term.setCursorPos(1,1)
  term.setBackgroundColor(32)
  term.setTextColor(tbtc)
  print("System")
  term.setBackgroundColor(256)
  term.setTextColor(128)
  term.setCursorPos(1,2)
  print("Terminate ")
  term.setCursorPos(1,3)
  print("Reboot	")
  term.setCursorPos(1,4)
  print("Shutdown  ")
  term.setCursorPos(1,5)
  print("Cancel	")
end
drawDesktop()
while true do
  local event, button, X, Y = os.pullEventRaw()
  if slc == 0 then
	if event=="mouse_click" then
	  if Y==1 and X >0 and X < 7 then
		drawSystem()
		slc=1
			else
		drawDesktop()
	  end
	  if X>1 and X<12 and Y>2 and Y<8 then
	  shell.run("dj")
	  drawDesktop()
	  end
	end
  elseif slc == 1 then
	if X>0 and X<11 and Y==2 and button==1 then
	  term.SetBackgroundColor(0x8)
	  term.setTextColor(0x1)
	  term.clear()
	  term.setCursorPos(22,10)
	  print("Goodbye!")
	  term.setCursorPos(-1,-1)
	  sleep(4)
	  term.setBackgroundColor(0x8000)
	  clear()
	  term.setCursorPos(1,1)
	  error()
	end

	if X>0 and X<11 and Y==3 and button==1 then
	  os.reboot()
	end
  
	if X>0 and X<11 and Y==4 and button==1 then
	  os.shutdown()
	end
  
	if X>0 and X<11 and Y==5 and button==1 then
	  drawDesktop()
	  slc=0
	end
  
	if X>0 and X<7 and Y==1 and button==1 then
	  drawDesktop()
	  slc=0
	end
  end
end

Whenever i click within the area specified at line 65 i get a skos:66: attempt to call nil error.

This area:

	if X>0 and X<11 and Y==2 and button==1 then
	  term.SetBackgroundColor(0x8)
	  term.setTextColor(0x1)
	  term.clear()
	  term.setCursorPos(22,10)
	  print("Goodbye!")
	  term.setCursorPos(-1,-1)
	  sleep(4)
	  term.setBackgroundColor(0x8000)
	  clear()
	  term.setCursorPos(1,1)
	end

I can't see why, i can't spot anything wrong at line 66/65. The other areas specified at the if statements just below works fine :/

Thanks in advance.

Split into new topic.

It's term.setBackgroundColor, not term.SetBackgroundColor. Capitalization is important.