It is deprecated, but the replacement API requires you to have an API key and charges you for more than 100 searches per day. I'm using the deprecated API until it is discontinued, then I'll release a new version of the gem that will, unfortunately, require you to sign up for an API key.
Edit: upon further investigation, the error seems to be with parsing the specific page http://www.test.com (here's the full trace: http://pastebin.com/Lqedy4eN ).