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ATM system doesn't work


I have been trying to make an atm system but uh the code gets the error:

bad argument #1 (string expected, got nil):

stack traceback:

[C]: in function 'error'

machine:1045: in function <machine:1042>

(...tail calls...)

/home/create:41 in main chunk

(...tail calls...)

[C]: in function 'xpcall'

machine:799: in global 'xpcall'

/lib/process.lua:63: in function </lib/process.lua:59>


here is the code:

local event = require("event")
local component = require("component")
local internet = component.internet
local cardwriter = component.os_cardwriter
local keypad = component.os_keypad

local args = {...}
local pin = ""
    keypad.setDisplay("Your PIN")
    while true do
        local action, _, _, char = event.pull()
        if action == "keypad" then
            if char == "#" then
            elseif char == "*" then
                pin = ""
                keypad.setDisplay("Your PIN")
                pin = pin .. char
local request = "username=" .. args[1] .. "&pin=" .. pin
local response = internet.request("http://localhost/create", request)
local id
while true do
    local tmp = response.read()
    if not (tmp == "") then
        id = tmp
cardwriter.write(id, "Bankcard", false)


any insight?

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