Core scripts are not guaranteed to be registered at the time you call the function, this is something similar with using WaitForChild on Instances.
You need to use pcall for this case, it's a function that runs given function with shield, which means if the function errors, it won't error but will return you the error message.
In your case i would create a loop to loop few times and try to disable the callback.
local StarterGui = game:GetService('StarterGui')
local function DIsableResetButton()
local RetryDelay = 0.25
local MaxTries = 8
local Tries = 0
while (true) do
Tries += 1
local Success, Response = pcall(
StarterGui.SetCore,
StarterGui,
"ResetButtonCallback",
false
)
if (Success) or (Tries >= MaxTries) then
break
end
wait(RetryDelay)
end
end
DisableResetButton()
In this case i made it loop 8 times, the delay between loops is 0.25 which means if all 8 tries fail, it will yield for 2 seconds total, if none fail it won't yield because of break, this keyword breaks the loop, in this case the while true loop, it will just stop it and won't finish current itteration. return can also be used, it will just stop the whole function and return given value or nil.
The reason you should be checking for total tries is because if roblox disables one of the features, the function will be repeating infinitely, in this case, it will do it for given amount of times.
i called pcall in this case with 4 arguments, the last 2 are the arguments that SetCore:ResetButtonCallback requires, the first one is the function to call and the second one is self, you should probably not worry about it but since you call SetCore with colon :, in this case you can't so you need to replace the colon somehow, in this case StarterGui since SetCore is function of it.
Success is whether the function succeeded and Response is the response from the function, if the function does not return anything, it's the error, in this case it is, if nothing errored, Response would be nil, else it will be the error so you can print it to debug stuff.
