[Error] Attempt to index (? a nil value) - ComputerCraft Forums (archive)

Posted 30 March 2013 - 05:45 AM

I am making a computer that sends file contents as a message through rednet. Here is the code for the server

Spoiler



rednet.open("top")
while true do
  event, id, message = os.pullEvent()
  if event == "rednet_message" then
    if message == "startup" then
      f = fs.open("startup","r")
      file = f.readAll() --WHERE MY ERROR IS
      f.close()
      rednet.send(id,file)
    end
  end
end

I am getting the error on line 7
What is wrong?
Thanks in advance!
-Viextra