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Attempt to index ? a nil value?

Kansas54's Photo Kansas54 13 Jan 2017

Here's my code:
http://pastebin.com/XFjh8jUa
The error happens at line 2.
I am clueless. anyone?
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Lyqyd's Photo Lyqyd 13 Jan 2017

Moved to Ask a Pro.
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Lupus590's Photo Lupus590 13 Jan 2017

fs.exists not sf.exists
Edited by Lupus590, 13 January 2017 - 07:14 PM.
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AlexDevs's Photo AlexDevs 13 Jan 2017

while true do
  local _, side = os.pullEvent("disk")
  if fs.exists(disk.getMountPath(side).."/KANSASBASE") then
	rs.setOutput("back",true)
	sleep(6)
	rs.setOoutput("back",false)
	disk.eject(side)
  end
end

Fixed + optimized
Edited by Ale32bit, 13 January 2017 - 09:47 PM.
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