This script only runs in Roblox studio’s testing server, and not in real game. Why?

I’m making a game and if players reset character there are happening much bugs... I found a way to disable it, but it doens’t work in the real game, only I studio. Here’s my script:

for i = 1, 5 do
          wait(1)
          local succes, exception = pcall (function()
                game:GetService(“StarterGui”):SetCore (“ResetButtonCallback”, false)
        end)
        if succes then
            break
      end
end

(Sorry if you find to many spaces, I copyd this via a picture of my IPad.) Happy Scripting!

Kind regards, Gamer_io