Attempt to index nil with "Chatted"

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#1

I’m making a puzzle game where there’s a room that has a riddle on a wall. When a player says the answer to the riddle in chat, the door opens. However, when I test it out, I get the error "Attempt to index nil with “Chatted.”

riddle = math.random(1, 10)
answer = "e"
if riddle == 1 then
	script.Parent.SurfaceGui.TextLabel.Text = "I have 104 keys, but only 3 locks, only one enter and only one escape, and I have space but no room. What am I?"
	answer = "keyboard"
elseif riddle == 2 then
	script.Parent.SurfaceGui.TextLabel.Text = "I have a neck, a lip, a cap, but no head. What am I?"
	answer = "bottle"
elseif riddle == 3 then
	script.Parent.SurfaceGui.TextLabel.Text = "I belong to you, but other people use it more than you do. What am I?"
	answer = "name"
elseif riddle == 4 then
	script.Parent.SurfaceGui.TextLabel.Text = "I come in a minute, twice in a moment, but never in a thousand years. What am I?"
	answer = "m"
elseif riddle == 5 then
	script.Parent.SurfaceGui.TextLabel.Text = "I can be the size of an elephant and not weigh an ounce. What am I?"
	answer = "shadow"
elseif riddle == 6 then
	script.Parent.SurfaceGui.TextLabel.Text = "I can be broken just by saying my name. What am I?"
	answer = "silence"
elseif riddle == 7 then
	script.Parent.SurfaceGui.TextLabel.Text = "I am an invention that lets you see through walls. What am I?"
	answer = "window"
elseif riddle == 8 then
	script.Parent.SurfaceGui.TextLabel.Text = "I can be cracked, made, told and played. What am I?"
	answer = "joke"
elseif riddle == 9 then
	script.Parent.SurfaceGui.TextLabel.Text = "I have cities, but no houses. I have mountains but no trees. I have water but no fish. What am I?"
	answer = "map"
else
	script.Parent.SurfaceGui.TextLabel.Text = "I can run, but I have no legs. I have a bank, but no money. I have a mouth, but no tongue. What am I?"
	answer = "river"
end

local player = game.Players.LocalPlayer
local door = script.Parent.Parent.Door

player.Chatted:connect(function(msg)
	if string.sub(string.lower(msg), 1,8)==string.lower(answer) then
		door.Transparency = 0.8
		door.CanCollide = false
		wait(2)
		door.Transparency = 0
		door.CanCollide = true
	end
end)
#2

LocalPlayer does not work i nregular scripts, only in Localscripts. Are you usign a regular script?

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#3

LocalPlayer only works on client. If you want this to work on server script, you should use:

game:GetService("Players").PlayerAdded:Connect(function(player)
	player.Chatted:connect(function(msg)
		if string.sub(string.lower(msg), 1,8)==string.lower(answer) then
			door.Transparency = 0.8
			door.CanCollide = false
			wait(2)
			door.Transparency = 0
			door.CanCollide = true
		end
	end)
end)
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