NoMethodError for YouTube library in lesson 5A

[eggnogg]

When running the following program:

# Why's YouTube? program.
Hacker('why').load_program('youtube.rb')
uri = ask("Enter the link to a YouTube? video:")
path = ask("Your name for this video:")
YouTube?.download(uri, path + ".flv")

with the following input:
YouTube? url: http://youtube.com/watch?v=LNVYWJOEy9A (provided in the tutorial)
Filename: Adventure Time (provided in the tutorial)

I get the following error:

[NoMethodError?] undefined method `[]' for nil:NilClass

C:\Program Files\Hackety Hack\ruby\lib/camping.rb:1593:

in `eval'C:\Program Files\Hackety Hack\ruby\lib/net/http.rb:543: in `start'C:\Program Files\Hackety Hack\ruby\lib/net/http.rb:440: in start'(eval):6:in keep_vid'(eval):13:in `download'(eval):5

I restarted HH and could not reproduce the error.