How would I go about stopping an error that says "attempt to call a string value"?

So I've been trying to make this shouting simulator game with a friend of mine and we both seem stumped (yet again) with this error. Note that this script is a server script and not a local or module

These are the pieces of code in question;

local function shout(points,shout,plr)
	addPoints(points,plr)
	
	local chr = plr.Character
	
	local sound = chr:WaitForChild("Head"):WaitForChild("Shout")
	
	sound.SoundId = shout
	sound:Play()
end

rs.Events.Shouted.Event:Connect(function(points,shout,plr)

	print(points)
	print(shout)
	print(plr)
	
	shout(points,shout,plr) -- This line is where the error comes from
end)

game.Players.PlayerAdded:Connect(function(plr)
	plr.CharacterAdded:Connect(function(chr)
		
		local shoutSound = Instance.new("Sound")
		shoutSound.Name = "Shout"
		shoutSound.Parent = chr:WaitForChild("Head")
	end)
end)

It says the error is on line 40 of the code (which I have specified in the code blocks) and I'm not sure where it's coming from.

Change your code to the following....

local function shout(points,shoutID,plr)
    addPoints(points,plr)

    local chr = plr.Character

    local sound = chr:WaitForChild("Head"):WaitForChild("Shout")

    sound.SoundId = shoutID
    sound:Play()
end

-- .......

rs.Events.Shouted.Event:Connect(function(points,myshout,plr) -- this was the real place where the type mismatch was occurring since you was using the same namespace as the function shout()!

    print(points)
    print(myshout)
    print(plr)

    shout(points,myshout,plr) -- This line is where the error comes from
end)

Explain: You've declared a function named shout, but then you use a variable named exactly the same.

The error you're getting is exactly what it says, "trying to call a string value" aka your string you declared in your shouted event. Lua thinks you're trying to call that string as if it's a function, but we know it's not. It's just a string!