bad argument #2 to 'random' (interval is empty) ?

local data = script.Parent
local ready = data.Ready
local chosen = data.Chosen


while true do
    local p = ready:GetChildren()
    wait()
    if ready.Value >= 2 then
	if #p > 0 then
	        wait(5)
	        chosen.Value = p[(math.random(1, #p))].Name
	end
    else
    end
end

The variable p is only defined once. It will not update itself if the amount of stuff inside of it is changed. I added a check to make sure that it's greater than 0.