$ crawl -v --max_depth=2 --whitelist="^.*sourceforge\.net.*$" http://sourceforge.net/projects/xine/files/xine-lib/
Crawling http://sourceforge.net/projects/xine/files/xine-lib/
Traceback (most recent call last):
  File "/usr/bin/crawl", line 9, in <module>
    load_entry_point('spyda==0.0.3.dev', 'console_scripts', 'crawl')()
  File "/usr/lib/python2.7/site-packages/spyda/crawler.py", line 277, in main
    result = crawl(url, **opts.__dict__)
  File "/usr/lib/python2.7/site-packages/spyda/crawler.py", line 114, in crawl
    whitelist.extend(allowed_urls)
TypeError: 'NoneType' object is not iterable