Nothing exists Problem Script

[iSyriux (Oneironaut)]

local char = game.Players.LocalPlayer.Character
char.Humanoid.Seated:Connect(function()
	if script.Value.Value==false then
		print("PPPP")
		script.Value.Value = true
		local e=script.ScreenGui:Clone()
		e.Parent = game.Players.LocalPlayer.PlayerGui
		e.Enabled = true
		e.LocalScript.Disabled = false
	end
end)

this is my scipt, using waitforchild for characters yields infinite yield,
using repeat wait() until findfirstchild character yields nothing/nil

[RealRudraAmin (Randy)]

repeat wait() until player.Character ~= nil

Should work.

Character is not a child of the LocalPlayer, but rather of workspace, so WaitForChild and FindFirstChild would not work.

[Quackers337 (DeletedUser)]

Change local char = ... to

local player = game.Players.LocalPlayer
local char = player.Character or player.CharacterAdded:Wait()

[slothfulGuy]

Try this instead, should work:

local player = game.Players.LocalPlayer
local character = workspace:WaitForChild(player.Name)

[VegetationBush (FartedAtLightspeed)]

@RudraVII @slothfulGuy
Both of your ways are not reccomended, as @Quackers337’s answer of local char = player.Character or player.CharacterAdded:Wait() is the recommended way.

@RudraVII

Character is not a child of the LocalPlayer, but rather of workspace, so WaitForChild and FindFirstChild would not work.

Actually, that’s how you are more or less supposed to reference the character. Review the answer before posting.

---

Back to the topic, I will highlight the mistakes:

local char = game.Players.LocalPlayer.Character -- The player is loaded before the character, so doing this might return nil
char.Humanoid.Seated:Connect(function() -- Will error if the character is nil
	if script.Value.Value==false then -- Try renaming the bool value to another name
		print("PPPP")
		script.Value.Value = true
		local e=script.ScreenGui:Clone()
		e.Parent = game.Players.LocalPlayer.PlayerGui
		e.Enabled = true
		e.LocalScript.Disabled = false
	end
end)

This is a fixed script:

local player = game.Players.LocalPlayer
local char = player.Character
if not char then
    char = player.CharacterAdded:Wait()
end
local Humanoid = char:WaitForChild("Humanoid")

char.Humanoid.Seated:Connect(function()
	if script.Value.Value==false then
		print("PPPP")
		script.Value.Value = true
		local e=script.ScreenGui:Clone()
		e.Parent = game.Players.LocalPlayer.PlayerGui
		e.Enabled = true
		e.LocalScript.Disabled = false
	end
end)

[iSyriux (Oneironaut)]

As long as it works

[colbert2677 (Dreamseeker)]

Even if it works, it’s not really an excuse to be reinventing the wheel or foregoing proper practice. There’s a lot that “works” yet isn’t proper or has better methods of going about doing something. Quackers suggested the proper way to do this and you should. Unnecessarily creating loops is a bad habit and less performant than relying on an event-based system.

[ZeezyRed (UnwaveringResolve)]

No. Please don’t do this.

Avoiding wait() and why

This is an adaptation of a Twitter thread I made a while ago. This is simply a better formatted and more fleshed out version. Let’s talk about wait(). Not wait(n) (although if you are using small n values to where it’d be barely distinguishable from wait(), you’re probably going to hit the same issues mentioned in this thread). We probably learned about wait() at first as the solution to “why are my infinite loops crashing me?”. It’s a super easy solution and it works! This starts a bad habit…

Instead, do

local Player = game:GetService("Players").LocalPlayer
local Character = Player.Character or Player.CharacterAdded:Wait()
local Humanoid = Character:WaitForChild("Humanoid")
Humanoid.Seated:Connect(function()
	if script.Value.Value == false then
		print("PPPP")
		script.Value.Value = true
		local e = script.ScreenGui:Clone()
		e.Parent = game.Players.LocalPlayer.PlayerGui
		e.Enabled = true
		e.LocalScript.Disabled = false
	end
end)

Note that I also did a :WaitForChild() to get Humanoid, to prevent errors from that too.