Why does this script when a part has been touched only work in studio, but not ingame?

I made a pad, that if you touch it, a gui pops up. But it only works in studio , but not ingame. Please help!

script:

local rp = game.ReplicatedStorage
local ev = rp.EnterPaintShop
local cam = game.Workspace.CurrentCamera
local debounce = false

function something(hit)
    if hit.Parent:FindFirstChild("Humanoid") then
local plr = game.Players:GetPlayerFromCharacter(hit.Parent)
        for i,v in pairs(plr.Character:GetChildren())do
    if v:IsA("Model") and v.Name == plr.Name.."'s Car" then
    v:Destroy()
    end
    for _,k in pairs(cam:GetChildren())do
    k:Destroy()
    end
    if not debounce then
    debounce = true
    local plr = game.Players:GetPlayerFromCharacter(hit.Parent)
    local c = plr:WaitForChild("SelectedCar").Value:Clone()
    c.Parent = game.Workspace.CurrentCamera
    c:SetPrimaryPartCFrame(game.Workspace.painttp.CFrame)
    plr.Character.Torso.CFrame = plr.Character.Torso.CFrame + Vector3.new(3,0,3)
    plr.Character.Humanoid.WalkSpeed = 0
    plr.PlayerGui.PaintGUI.Enabled = true
    cam.CameraSubject = game.Workspace.painttp
    debounce = false
        end
        end
    else
        return nil
    end
end

script.Parent.Touched:Connect(something)