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)