Script has an error while trying to loop, how do i fix that?

hi i have a script error, can somebody help me solve this?

local thingtosay = {"Zamknij Przejazd!/Close the Crossing!"}
	local interval = 3
	local colour = "Red"


	while wait () do
		for _ v in pairs (thingtosay) do
			game:GetService("Chat"):Chat(script.Parent, v, colour)
			wait(interval)
		end
	end