Why does it give me this error message?

you see, I've been practicing my scripting and I got this error message that I don't understand. here is my code:

local Listofnames = "TroytheDestroyer, DadatheDestroyer, "
local playeradded = game.Players.PlayerAdded
if playeradded == listofnames then -- global listofnames unknown
Print game.Players.LocalPlayer..'is verified.' -- I want it to put the player's name that joined in the output.
end
if playeradded ~= listofnames then -- global listofnames unknown
Player:Kick() -- global Player unknown
Print game.Players.LocalPlayer..'has been kicked due to insufficent privilages.'
end -- is that what i do to make the kicked player's name appear on the output?
-- to all of you who saw this script before, I just want to test my scripting. so this is my first script im going to make.

thanks for reading.