attempt to concatenate local 'message' (a userdata value), what is this, and how do I fix it?

I've been trying to make a chat and I've been running into this problem where it says "attempt to concatenate local 'message' (a userdata value)" and I've fixed it before but then I broke it and forgot how I fixed it, yeah, I broke it while trying to fix another problem so I came here after trying again and again to no avail, I didn't get it to work again. I've got 3 scripts, a local script, a server script, and a module script. Don't ask why I renamed the scripts to weird names, I just thought they sounded fitting. Anyways here they are. I posted them in the order they are activated.

Local Script:

focusButton = "Slash"
gui=script.Parent.Parent
--[[TouchScreenEnum = {Enum.Platform.WiiU,Enum.Platform.Android,Enum.Platform.AndroidTV,Enum.Platform.Chromecast,
Enum.Platform.IOS,Enum.Platform.Ouya}
consoleEnum = {Enum.Platform.XBox360,Enum.Platform.XBoxOne}

for i,v in ipairs(TouchScreenEnum, consoleEnum) do
	if game.Players.LocalPlayer.OsPlatform==v then
		script.Parent.NonPCOS:InvokeServer(game.Players.LocalPlayer.OsPlatform)
		break
	end
end]]
script.Parent.Parent.ChatBox.FocusLost:connect(function(enterPressed)
    if enterPressed then
        script.Parent.SendMessage:InvokeServer(game.Players.LocalPlayer,gui.ChatBox.Text)
    end
end)
script.Parent.Parent.ChatBox.ImageButton.MouseButton1Click:Connect(function()
	script.Parent.SendMessage:InvokeServer(game.Players.LocalPlayer,gui.ChatBox.Text)
end)
game:GetService("UserInputService").InputBegan:Connect(function(IO,GPE)
	if Enum.KeyCode[focusButton]==IO.KeyCode and not gui.ChatBox:IsFocused() then
		script.Parent.Parent.ChatBox:CaptureFocus()
	end
end)

Server Script:

eventProcessor = require(script.Parent.EventProcessor)
ts = game:GetService("TextService")
--[[script.NonPCOS.OnServerInvoke:Connect(function(OS)
	if OS==Enum.Platform.XBox360 or OS==Enum.Platform.XBoxOne then
		script.Parent.ChatBox.PlaceholderText="Press select and press A here to chat."
	else
		script.Parent.ChatBox.PlaceholderText="Tap here to chat."
	end
end)]]
function script.SendMessage.OnServerInvoke(plr,text)
	script.Parent.ChatBox.Text=""
	local success,errorMessage = pcall(function()
		filteredText = ts:FilterStringAsync(text,plr.UserId)
	end)
	if success then
		eventProcessor.AddMessage(plr,filteredText)
	else
		eventProcessor.RecieveMessage("SYSTEM","Sorry, "..plr.Name
	.." but there has been an error and your text has not been sent, please resend your message. Error: "..errorMessage
	.." Only you can see this message")
	end
end

Module Script:

local module = {}
ts = game:GetService("TextService")
sStorage = game:GetService("ServerStorage")
messages = 0
function module.AddMessage(plr,message)
	if #script.Parent.ChatFrame:GetChildren()>=8 then
		script.Parent.ChatFrame.CanvasSize.Y.Offset=script.Parent.ChatFrame.CanvasSize.Y.Offset+25
	end
	for i,v in ipairs(game.Players:GetChildren()) do
		local chat = sStorage.playerName:Clone()
		chat.Name=plr.Name
		chat.message="["..plr.Name.."]: "..message
		chat.Parent=v.PlayerGui.Chat.ChatFrame
		chat.Position.Y.Offset=25*#v.PlayerGui.Chat.ChatFrame:GetChildren()
		messages=#script.Parent.ChatFrame:GetChildren()
	end
end
function module.RecieveMessage(plr,message)
	if #script.Parent.ChatFrame:GetChildren()>=8 then
		script.Parent.ChatFrame.CanvasSize.Y.Offset=script.Parent.ChatFrame.CanvasSize.Y.Offset+25
	end
	local chat = sStorage.playerName:Clone()
	chat.Name=plr.Name
	chat.message="["..plr.Name.."]: "..message
	chat.Parent=script.Parent.ChatFrame
	chat.Position.Y.Offset=25*#script.Parent.ChatFrame:GetChildren()
	messages=#script.Parent.ChatFrame:GetChildren()
end
return module

Any help? I probably will forget about this in a day, so please be quick if possible, I don't need a script, just some advice or ideas, thanks in advance!

I can't read some of the lines because they were too long and got cut off, but I think you are concatenating the player object instead of its name at line 18 in the server script.