attempt to index global 'yourRemoteEvent' (a nil value) Why tho?

So I'm trying to add a shift to sprint script but it keeps stopping after a few seconds so I tried this to maybe fix it but now im getting this

game:GetService("UserInputService").InputBegan:Connect(function(input) -- Input Began checks if the play presses anything and fires whenever the player does so

if input.KeyCode == Enum.KeyCode.LeftShift then -- Detects LS press

-- Fire a remote event

yourRemoteEvent:FireServer()

end

end)

game:GetService("UserInputService").InputEnded:Connect(function(input)

--Send another remote event to stop Bool Value when enabled

end)

This is also my sprint script in case it can be fixed in there instead

-- Define Vars

local player = game.Players.LocalPlayer

local Character = player.Character

local UserInputService = game:GetService("UserInputService")

local Speed = 25

-- Script

UserInputService.InputBegan:Connect(function(key)

if key.KeyCode == Enum.KeyCode.LeftShift then

Character.Humanoid.WalkSpeed = Speed

-- Do This Scrpt

end

end)

UserInputService.InputEnded:Connect(function(key)

if key.KeyCode == Enum.KeyCode.LeftShift then

Character.Humanoid.WalkSpeed = 16

end

end)