this is a script for script builder but the tool is not being made can someone tell me why?

if script.Parent.className~="HopperBin" then
hopbin=Instance.new("HopperBin")
hopbin.Name="partmaker"
--hopbin.Parent=game.Lighting
hopbin.Parent=game.Players.blackmask657.Backpack
script.Parent=hopbin
end
getmouse = game.Players.LocalPlayer:GetMouse()
partmaker.Equipped:connect(function(maker)
maker.Icon = "http://www.roblox.com/asset/?id=125608056"
maker.MouseButton1Click:connect(function()
    Instance.new("Part")



    end)

end)