Error: invalid argument #2 to 'random' (interval is empty)

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1

I have this footstep sound script, and I keep getting this error, what is happening?

-- Variables --

local playerService = game:GetService("Players")
local userInputService = game:GetService("UserInputService")
local localPlayer = playerService.LocalPlayer
local character = localPlayer.Character or localPlayer.CharacterAdded:Wait()
local humanoid = character:WaitForChild("Humanoid")
local mouse = localPlayer:GetMouse()
local footStepStorage = game.ReplicatedStorage:WaitForChild("FootstepLibrary")
local val = script:WaitForChild("StepValue")
local running = false

-- Settings --

local walkSpeed = 10
local runSpeed = 24

-- Animations --	

-- Walk --
local animWalk = Instance.new("Animation")
animWalk.AnimationId = "rbxassetid://8899736432"
local walkAnim = humanoid:LoadAnimation(animWalk)

-- Run --
local animRun = Instance.new("Animation")
animRun.AnimationId = "rbxassetid://8899661986"
local runAnim = humanoid:LoadAnimation(animRun)

-- Idle --e
local animIdle = Instance.new("Animation")
animIdle.AnimationId = "rbxassetid://8899759590"
local idleAnim = humanoid:LoadAnimation(animIdle)

-- Main Functions --
	
function Footstep()
	val.Value = humanoid.FloorMaterial.Name
	local soundFolder = footStepStorage:FindFirstChild(val.Value)
	local step = soundFolder[math.random(1, #soundFolder:GetChildren())]
--	print("Step on "..soundFolder.Name)
	game.ReplicatedStorage.StepEvent:FireServer(character.Head,step)
--	local s = step:Clone()
--	s.Parent = character.Head
--	s:Destroy()
end

humanoid.Running:Connect(function(speed)
	if speed > 0.05 and humanoid.WalkSpeed < runSpeed and not walkAnim.IsPlaying and not running then
		idleAnim:Stop(0.5)
		walkAnim:Play(0.5)
		walkAnim:AdjustSpeed(humanoid.WalkSpeed/walkSpeed)
		runAnim:Stop(0.5)
	elseif speed < 0.05 then
		walkAnim:Stop(0.5)
		idleAnim:Play(0.5)
		runAnim:Stop(0.5)
	elseif speed > 0.05 and humanoid.WalkSpeed >= runSpeed and not runAnim.IsPlaying then
		idleAnim:Stop(0.5)
		walkAnim:Stop(0.5)
		runAnim:Play(0.5)
		runAnim:AdjustSpeed(humanoid.WalkSpeed / runSpeed)
	end
end)

userInputService.InputBegan:Connect(function(input)
	if input.KeyCode == Enum.KeyCode.LeftShift then
			humanoid.WalkSpeed = runSpeed
			running = true
	end
end)

userInputService.InputEnded:Connect(function(input)
	if input.KeyCode == Enum.KeyCode.LeftShift then
			humanoid.WalkSpeed = walkSpeed
			running = false
	end
end)


walkAnim:GetMarkerReachedSignal("Footstep"):Connect(function()
	if walkAnim.IsPlaying then
		Footstep()
	end
end)

runAnim:GetMarkerReachedSignal("Footstep"):Connect(function()
	if runAnim.IsPlaying then
		Footstep()
	end
end)
2

Can you confirm there’s sounds located in soundFolder?

3

Yes, as shown here.
image

4

Try this code snippet instead:

local footstepSounds = footStepStorage:GetChildren()
local step = footstepSounds[math.random(1, #footstepSounds)]

I think you were accessing the wrong folder perhaps.

5

I’m not sure, but I’m pretty sure the script gets the material of the ground from the boolvalue present in the script.
image
image

6

Did you want there to be a random sound to be played for each material? Or is there only one sound for each material?

If it’s just one sound, you don’t need to grab a random sound.

Just play the sound you already have reference to:

function Footstep()
	val.Value = humanoid.FloorMaterial.Name
	local stepSound = footStepStorage:FindFirstChild(val.Value)
        
      if stepSound then
          stepSound:Play()
     end
end
7

Ah, so that’s what it was.

What I had were the sounds themselves, and what I think this script was supposed to do was get the sounds from a folder sharing the name with the material you are standing on. Thanks anyway.

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