I execute the script cmd: ..\lua5.1 youtubevid.lua 73fEvgnYG3c,
and shows following errors:
Getting Video Info: 73fEvgnYG3c
..\lua5.1: YouTubeVideo.lua:44: attempt to perform arithmetic on a nil value
stack traceback:
        YouTubeVideo.lua:44: in function 'parsexmldetails'
        youtubevid.lua:28: in main chunk
        [C]: ?