Error?

--functions that make coding easier
function reset ()
    term.clear()
    term.setCursorPos(1,1)
end

function printColor (x,y)
    term.setTextColor(y)
    print(x)
    term.setTextColor(colors.white)
end

function line ()
    print("")
end

function tableCheck (inp,tab)
    n = table.maxn(tab)
    while n > 0 do
        if inp == tab[n] then return n end
        n = n-1
    end

    return false
end
--item variables
item = {}
itemDmg = {}
itemDmgType = {}
itemEquip = {}
itemEquipDef = {}
itemQuest = {}
itemDesc = {}

--item functions
function itemRegister (name)
    item[table.maxn(item)+1] = name
    return
end

function itemRegisterId (name,id)
    item[id] = name
    return
end

function itemSetDmg (name,dmg)
    itemDmg[tableCheck(name,item)] = dmg
    return
end

function itemSetDmgType (name,dmgtype)
    itemDmgType[tableCheck(name,item)] = dmg
    return
end

function itemEquipable (name)
    itemEquip[tableCheck(name,item)] = true
    return
end

function itemQuest (name)
    itemQuest[tableCheck(name,item)] = true
    return
end

function itemSetDesc (name,desc)
    itemDesc[tableCheck(name,item)] = desc
    return
end

--world functions
function worldGen (size)
    line()
    print("Generating world terrain...")
    local n = 100

    while n > 0 do
        worldBiome[n] = 0
        n = n-1
    end
    print("Adding snow...")

    snowside = math.random(1,2)
    if snowside == 1 then local start = 15 else local start = 75 end
    local n = 25

    while n > 0 do
        worldBiome[start+n] = 1
        n = n-1
    end

    print("Adding sand...")

    local xx = math.random(1,2)
    if xx == 1 then local start = 30 else start = 60 end
    local n = 10

    while n > 0 do
        worldBiome[n+start] = 2
        n = n-1
    end

    print("Generating hills...")

    local n = 100

    while n > 0 do
        local xx = math.random(1,6)
        if xx == 1 then worldHill[n] = 1 else worldHill[n] = 0 end
        n = n-1
    end

    print("Placing rocks in the dirt...")
    local n = 100

    while n > 0 do
        local xx = math.random(1,2)
        if worldBiome[n] == 1 and xx == 1 then worldIce[n] = 1 elseif xx == 2 then worldIce[n] = 0 end
        if worldBiome[n] ~= 2 and worldBiome[n] ~= 3 and worldBiome[n] ~= 4 and worldBiome[n] ~= 8 and worldBiome[n] ~= 9 and worldBiome[n] ~= 11 and worldBiome[n] ~= 13 and worldBiome[n] ~= 14 and worldBiome[n] ~= 15 then worldStone[n] = 1 elseif xx == 2 then worldStone[n] = 0 end
        n = n-1
    end
    print("Adding clay...")

    local n = 100

    while n > 0 do
        local xx = math.random(1,3)
        if worldBiome[n] == 0 or worldBiome == 12 then
            if xx == 1 then worldClay[n] = 1 else worldClay[n] = 0 end
        end
        n = n-1
    end

    print("Generating caves...")
    local n = 100

    while n > 0 do
        local xx = math.random(1,6)
        if worldBiome[n] == 4 or worldBiome[n] == 6 then
            if xx == 1 or xx == 2 then worldCave[n] = 1 else worldCave[n] = 0 end
        else
            if xx == 1 then worldCave[n] = 1 else worldCave[n] = 0 end
        end
        n = n-1
    end

    print("Generating jungle...")

    if snowside == 2 then local start = 10 else start = 70 end
    local n = 20

    while n > 0 do
        worldBiome[start+1] = 12
        n = n-1
    end
    print("Adding shinies...")
    local n = 100

    while n > 0 do
        local xx = math.random(1,3)
        if xx == 1 then
            if worldBiome[n] == 0 then worldCopper[n] = 1 end
        elseif xx == 2 then
            worldCopper[n] = 0
        end
        n = n-1
    end

    print("Creating dungeon...")
    local xx = math.random(1,2)
    if xx == 1 then
        local n = 100

        while n > 0 do
            if n == 8 then
                worldDungeon[n] = 1
            else
                worldDungeon[n] = 0
            end
        end
    elseif xx == 2 then
        local n = 100

        while n > 0 do
            if n == 92 then
                worldDungeon[n] = 1
            else
                worldDungeon[n] = 0
            end
        end
    end
    print("Making the world evil...")
        local xx = math.random(1,2)

        if snowside == 1 then local start = 10 else start = 70 end
        local n = 25

        while n > 0 do
            if xx == 1 then
                if worldBiome[start+n] == 1 then
                    worldBiome[start+n] = 6
                elseif worldBiome[start+n] == 2 then
                    worldBiome[start+n] = 8
                else
                    worldBiome[start+n] = 3
                end
            elseif xx == 2 then
                if xx == 1 then
                    if worldBiome[start+n] == 1 then
                        worldBiome[start+n] = 7
                    elseif worldBiome[start+n] == 2 then
                        worldBiome[start+n] = 9
                    else
                        worldBiome[start+n] = 4
                    end
                end
            end
            n = n-1
        end
    print("Growing cacti...")
    local n = 100

    while n > 0 do
        if worldBiome[n] == 2 or worldBiome[n] == 8 or worldBiome[n] == 9 then
            worldCacti[n] = 1
        else
            worldCacti[n] = 0
        end
        n = n-1
    end
    print("Planting trees...")
    local n = 100

    while n > 0 do
        if worldBiome[n] == 0 or worldBiome[n] == 1 or worldBiome[n] == 3 or worldBiome[n] == 4 or worldBiome[n] == 12 or worldBiome[n] == 13 then
            worldTrees[n] = 1
        else
            worldTrees[n] = 0
        end
        n = n-1
    end

    return
end

--world variables
worldBiome = {}
worldHill = {}
worldStone = {}
worldIce = {}
worldClay = {}
worldCave = {}
worldCopper = {}
worldDungeon = {}
worldCacti = {}
worldTrees = {}
worldGrass = {}
worldChest = {}
playerLoc = 50

--inventory variables
inv = {}

--inventory functions
function invAdd (name,amount)
    inv[tableCheck(name,item)] = inv[tableCheck(name,item)]+amount
    return
end

function invTake (name,amount)
    if inv[tableCheck(name,item)] < amount then return false
    else
        inv[tableCheck(name,item)] = inv[tableCheck(name,item)]-amount
        return true
    end
end

function invGetAmout (name)
    return inv[tableCheck(name,item)]
end

--game

function menu ()
    local cnf = 0
    reset()
    print("Choose a world size.")
    line()
    print("[1] Small")
    print("[2] Medium")
    print("[3] Large")
    line()
    term.setTextColor(colors.yellow)
    term.write("? ")
    term.setTextColor(colors.white)
    local input = read()

    if input == "1" or input == "2" or input == "3" then worldGen(input-1) game() end
end

function game ()
    while true do
        playerLoc = 50

        print(worldBiome[50])
    end
end

menu()