Need help fixing my inventory and crafting script (?)

I have been trying to make an inventory gui script that when you touch a brick named TouchPart it gives you 30 Wood and you can craft a axe by pressing a gui button for 30 wood but for some reason its not working anyone got any ideas on my its not working?

local GUI = script.Parent
local inv = script.Parent.Inventory
local invParts = inv:GetChildren()

local buyFrame = GUI.BuyFrame
local craftAxe = GUI.CraftAxe

local plr = game.Players.LocalPlayer

local touching = false

local inGUI = false

workspace.TouchPart.Touched:connect(function(hit)
        local hum = hit.Parent:FindFirstChild("Humanoid")
        if hum then
            for i, v in pairs(invParts) do
                wait(0.5)
                if v.SlotValue.Value == "" then
                    v.SlotValue.Value = "Wood"
                    v.Ammt.Value = 30
                    v.SlotLabel.Text = v.Ammt.Value 
                    v.SlotImage.Image = "http://www.roblox.com/asset/?id=539465370"                 
                    break
                elseif v.SlotValue.Value == "Wood" then
                    v.Ammt.Value = v.Ammt.Value - 30
                    v.SlotLabel.Text = v.Ammt.Value
                    break
                end
            end
        end
    end
end)

craftAxe.MouseButton1Click:connect(function()
    for i, v in pairs (invParts)do
        wait (0.5)
        if v.SlotValue.Value == "Wood" then
            if v.Ammt.Value >= 30 then
                v.Ammt.Value = v.Ammt.Value - 30
                v.SlotLabel.Text = v.Ammt.Value

                for i, v in pairs(invParts)do
                    wait(0.5)
                    if v.SlotValue.Value == "" then
                        Print("A")
                        v.SlotValue.Value = "WoodAxe"
                        v.Ammt.Value = 1
                        v.SlotLabel.Text = v.Ammt.Value
                        v.SlotImage.Image = "http://www.roblox.com/asset/?id=540955027"
                        break
                        end 
                    end
                end
            end
        end
    end
end)