Assign Class script not working?

So I edited this Assign Class script to fit my game and weapons. It is a Local Script, and works fine in ROBLOX Studio solo, but whenever I go to test in on a server or in game, it doesn't work.

Basically what happens is it will give the player the tool, but nothing happens when I try to equip it. The gun scripts I have are pretty "fancy" as well, and are supposed to put the gun on the player's back if it is unequipped (and have a special equipped animation). However, as I mentioned, nothing happens, and whenever I equip the gun (which is not even there), my player's arms don't even move.

Here is the script:

local player = script.Parent.Parent.Parent 
backpack = player.Backpack 

function chooseClass(class)
    for i, v in pairs(backpack:GetChildren()) do v:remove() end
    for i, v in pairs(class:GetChildren()) do
        if v:IsA("Tool") then
            v:clone().Parent = backpack
        elseif v:IsA("HopperBin") then
            v:clone().Parent = backpack
        end
    end
    script.Parent.Main.Visible = false --no new class for a little bit
    wait(3454350)
    script.Parent.Main.Visible = false --allow to pick a different class
end

for i, v in pairs(script.Parent.Main:GetChildren()) do
    v.MouseButton1Up:connect(function () chooseClass(v) end)
end

Output doesn't say anything either.