How do you use HapticService to make the player's controller vibrate when dead?

I was working on a game where it is mainly centered around the xbox controller. I thought it would be cool for the gamepad to rumble when you die, so I looked on the roblox wiki and made a localscript that looks like this:

local plr = game.Players.LocalPlayer
local haptics = game:GetService("HapticService")
plr.Character.Humanoid.Died:connect(function()
haptics:SetMotor(
 Enum.UserInputType.Gamepad1,
 Enum.VibrationMotor.Large,
 0.8)
wait(0.4)
haptics:SetMotor(
 Enum.UserInputType.Gamepad1,
 Enum.VibrationMotor.Large,
 0)		
end)

It worked fine in the testing mode for studio, but when I tried it in my actual server, it did not work and it showed this error message:

Players.TroytheDestroyer.Backpack.Vibration:3: attempt to index field "Character" (a nil value)

I have worked with the property "Character" in a localscript before, but now all of a sudden it doesn't work.

Thank you!

Sometimes localscripts load before the game's models load. As such, you should use WaitForChild frequently when looking for children of the game. Here is the end script:

local plr = game.Players.LocalPlayer
local haptics = game:GetService("HapticService")

plr:WaitForChild("Character").Humanoid.Died:connect(function()
	haptics:SetMotor(Enum.UserInputType.Gamepad1, Enum.VibrationMotor.Large, 0.8)
	wait(0.4)
	haptics:SetMotor(Enum.UserInputType.Gamepad1, Enum.VibrationMotor.Large, 0)     
end)

have you committed your scripts when you published the game?