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