Looks like you're still using the old code from the first post.
The link I've linked to several times over the past few posts, both for you, and for others, line 129 is blank, and the 'update' fixes a Gmod12 function http.Get to a Gmod13 function http.Fetch.
Make sure you're using the latest on the server.
Line 128, 129, and 130 of the file that error shows should look like below.
local getTheLength = function()
http.Fetch( "http://gdata.youtube.com/feeds/api/videos/" .. video_id .. "?v=2", function( content, length, headers, returncode )
129 is actually blank, but, I'm not sure if Gmod returns the line before the error, or actual line of.