Screengui work in workspace but not in replicated storage ?

Hello , i have a game with placement script . But i created a conveyor with upgrades, if i click the button for upgrade when the conveyor is in Workspace , my gui open and i can buy it , but when the conveyor is in Replicated Storage and i place it in Workspace with my placement script , if i click the upgrade button, my gui don’t open.I have no errors in Output. This is the upgrade script :

local Players = game:GetService("Players")

local name = "speed for 0 ?" --name of upgrade

local cash = 0



Players.PlayerAdded:Connect(function(player)

script.Parent.ClickDetector.MouseClick:Connect(function(plr)-- if i click the button

player.PlayerGui:WaitForChild("Upgrades").Frame.Visible = true -- make the gui visible

script.Parent.BrickColor = BrickColor.new("Neon orange")-- make the button orange

player.PlayerGui:WaitForChild("Upgrades").Frame.TextLabel.Text = ("Are you sure to upgrade ".. name )--edit a text in gui

player.PlayerGui:WaitForChild("Upgrades").Frame.TextButton.MouseButton1Click:connect(function()--if i click the upgrade button in the gui

player.leaderstats.Cash.Value = player.leaderstats.Cash.Value - cash-- my money - the price

script.Parent.BrickColor = BrickColor.new("Bright green") --make the button green

script.Parent.Parent.Parent["Main Conveyor"].Velocity = script.Parent.Parent.Parent["Main Conveyor"].Velocity *2 --increase the conveyor velocity x 2

end)

end)

end)