Chatbox peripheral help

I am trying to have the computer read from chat, replace all '@' with '.' (because I can't type . in chat), then execute the command. When I tell it a command it throws the error:

string:1:attempt to index ? (a nil value)

Here is the code:

chat = peripheral.wrap("left")

local cmd = nil

while true do
  event, side, player, mes = os.pullEvent("chat_message")
  print(player.." said: "..mes)
  if mes:sub(0,9) == "Chatbox, " then
	cmd = mes:sub(10,-1)
	cmd = string.gsub(cmd,"[@]",".")
	local command = loadstring(cmd)()
  end
end

Please help! Thanks!

did you retype the program here on the forums? if so confirm you've spelt peripheral in the peripheral.wrap call correctly in your program.

theoriginalbit, on 01 July 2014 - 05:24 AM said:

did you retype the program here on the forums? if so confirm you've spelt peripheral in the peripheral.wrap call correctly in your program.

No, I uploaded the program to pastebin and copy/pasted it over to the forums.

It's not complaining about the first line of this script, but rather something's going awry in "string". It'll be triggered by either the attempt to pull substrings, or the gsub.

If you want the first nine characters of mes, you'd use:

mes:sub(1,9)

If you want the tenth character onwards, you'd use:

mes:sub(10)