error for craftos-pc

local w,h = term.getSize()
if not term.isColor() then return printError("Advanced Computer Required.") end
local run = true

local seed = os.epoch("utc") -- true randomness
math.randomseed(seed)
math.random(1,1) -- to avoid prediction w/ CraftOS-PC

local player = {}
player.money = 0
player.location = 1
player.plots = {}

local stock = {}
stock.level = 0
stock.value = .1
stock.maxrate = 10 -- 1 in 10 chances (10%)
stock.minrate = 2 -- 1 in 2 chances (50%)
stock.caps = 10

--[[

Menu engine

]]--

function m(x,y,x2,y2,menu)
    menu = menu or error("Failed to load Menu.")
    x,y = x or error("Failed to load x"), y or error("Failed to load y")
    x2,y2 = x2 or error("Failed to load x2"), y2 or error("Failed to load y2")
    local sel, scroll, run, w, h = 1,0,true, term.getSize()
    while run do
        for i=1, y2-y do
            if menu[i+scroll] ~= nil then
                term.setCursorPos(x,y+i-1)
                if sel == i then write("> ") else write("  ") end write(menu[i+scroll])
            end
        end
        a,b = os.pullEvent("key")
        if b == keys.w or b == keys.up then
            if sel == 1 and scroll ~= 0 then
                scroll = scroll - 1
            elseif sel ~= 1 then
                sel = sel - 1
            end
        elseif b == keys.s or b == keys.down then
            if sel == y2-y and scroll ~= #menu-(y2-y) then
                scroll = scroll + 1
            elseif sel ~= math.min(y2-y,#menu) then
                sel = sel + 1
            end
        elseif b == keys.e or b == keys.enter then
            return sel+scroll
        end
    end
end

--[[

Menu engine

]]--

function runMenu()
    while run do
        sleep(5)
    end
end

function runStock()
    while run do
        sleep(1)
        local res = math.random(1,math.random(stock.minrate, stock.maxrate))
        if res == 1 then
            term.setTextColor(colors.green)
            stock.level = math.max(stock.level+stock.value, stock.caps)
            res = "^"
        else
            term.setTextColor(colors.red)
            stock.level = math.min(stock.level-stock.value, stock.caps)
            res = "!"
        end
        term.setCursorPos(1,1)
        print("Stock: "..stock.level.." "..res)
    end
end

function run()
    parallel.waitForAny(runStock)
end

run()