Can someone help me with this Script?

I want it to randomly choose a Player and post a Message. Error: bad argument #2 to 'random' (number expected, got table) Thats what roblox tells me

local PlayerTable = game.Players:GetPlayers()
local ChosenPlayer = PlayerTable[math.random(1,#PlayerTable)]
local m = Instance.new ("Message")

while true do
	wait(10)
	m.Parent = game.Workspace
m.Text = "The player that has been chosen is:"..ChosenPlayer"Congratulations!"
wait (4)

m:remove()
end

Thank you.

while true do
	m = Instance.new ("Message")--moved this down here so we get a new message everytime.
	wait(10)
	PlayerTable = game.Players:GetChildren()--moved this so it gets a new table instead of using the old one.
	ChosenPlayer = PlayerTable[math.random(1,#PlayerTable)]--I moved this down here so it chooses a new random player everytime instead of once.
	m.Parent = game.Workspace
	m.Text = "The player that has been chosen is: "..ChosenPlayer.Name..", Congratulations!"--Changed this up a bit.
	wait (4)
	m:Destroy()--Changed this to destroy because it works better, or so they say.
end

Well there you go. :)