[LUA][Error] attempt to call boolean?

-- Variables --

ver = "1.0"
author = "Mackan90096"

w, h = term.getSize()

char = "@"
charX = 2
charY = 10
maxX = w-1
maxY = h-1
lvl = 1
money = 100
inv = false
shop = false
player = "player"
-- Tables --

-- Levels --

xpTable = {
[1] = 100,
[2] = 200,
[3] = 500,
[4] = 1000,
[5] = 2500,
[6] = 4000,
[7] = 5000,
[8] = 7500,
[9] = 10000,
[10] = 11500}

lvlHPTable= {
[1] = 10,
[2] = 20,
[3] = 40,
[4] = 50,
[5] = 100,
[6] = 200,
[7] = 400,
[8] = 500,
[9] = 750,
[10] = 1000}

--[[Items Declare as:
name
lvlNeeded
atkPoints
Type
cost
ID ]]--

item1 = {"Wooden Sword", 1, 1, "Sword", 100, 1}

-- End Items --

-- End Levels --

-- End Tables --

-- Keys --

up = 200
down = 208
left = 203
right = 205
enter = 28
space = 57
i = 23
p = 25
esc = 1

-- End Keys --

-- End Variables --

-- Functions --

-- Text Functions --

function centerPrint(string, X, Y)
  term.setCursorPos(math.floor(w-string.len(string))/X, Y)
  print(string)
end

-- End Text Functions --

-- Moving Functions --

function Up()
  term.setCursorPos(charX, charY)
  print(" ")
  charY = charY - 1
  term.setTextColor(colors.yellow)
  term.setCursorPos(charX, charY)
  print(char)
end

function Down()
  term.setCursorPos(charX, charY)
  print(" ")
  charY = charY + 1
  term.setTextColor(colors.yellow)
  term.setCursorPos(charX, charY)
  print(char)
end 

function Left()
  term.setCursorPos(charX, charY)
  print(" ")
  charX = charX - 1
  term.setTextColor(colors.yellow)
  term.setCursorPos(charX, charY)
  print(char)
end

function Right()
  term.setCursorPos(charX, charY)
  print(" ")
  charX = charX + 1
  term.setTextColor(colors.yellow)
  term.setCursorPos(charX, charY)
  print(char)
end

-- End Moving Functions --

function inventory()
  term.clear()
  width = 1
  term.clear()
  term.setBackgroundColor(colors.white)
  for x = 1, width do term.setCursorPos(1, x) term.clearLine() end
  for x = h - width + 1, h do term.setCursorPos(1, x) term.clearLine() end
  for i = 1, width do
    for x = 1, h do term.setCursorPos(i, x) term.write(" ") end
    for x = 1, h do term.setCursorPos(w - i + 1, x) term.write(" ") end
  end
  centerPrint("Inventory of "..player,2,1)
end

function shop()
term.clear()
end

function desktop()

  function frame()
    term.setBackgroundColor(colors.black)
    width = 1
    term.clear()
    term.setBackgroundColor(colors.red)
    for x = 1, width do term.setCursorPos(1, x) term.clearLine() end
    for x = h - width + 1, h do term.setCursorPos(1, x) term.clearLine() end
    for i = 1, width do
      for x = 1, h do term.setCursorPos(i, x) term.write(" ") end
      for x = 1, h do term.setCursorPos(w - i + 1, x) term.write(" ") end
    end
  end
  frame()
  term.setBackgroundColor(colors.black)
  term.setTextColor(colors.yellow)
  term.setCursorPos(charX, charY)
  print(char)
  while true do
    e, p1, p2, p3 = os.pullEvent()
    if e == "key" then
      if p1 == up then
        if inv == false or shop == false then
        if charY > 2 then
          Up()
        end
        end
      elseif p1 == down then
        if inv == false or shop == false then
        if charY < h-1 then
          Down()
          end
        end
      elseif p1 == left then
        if inv == false or shop == false then
        if charX > 2 then
          Left()
          end
        end
      elseif p1 == right then
        if inv == false or shop == false then
        if charX < w-1 then
          Right()
          end
        end
      elseif p1 == i then
        if inv == false then
          inv = true
          inventory()
        else
          inv = false
          desktop()
        end
      elseif p1 == p then
        if shop == false then
          shop = true
          shop()
        else
          shop = false
          desktop()
      end
    end
  end
end
end


desktop()