No, this is not a real Sinatra error :).
This is the personal homepage of Elad Meidar, a web developer and an entrepreneur specializing in Ruby on Rails. I hang around in Israel, and i am currently having the best time of my life over at Fiverr.com
I am a proud member of RailsBridge, Helping new Rails developers get into our world and also contributed a few Patches to the Ruby on Rails core.
I decided to shutdown pdfetch.com, although it was a nice idea, i don’t really have the time to take care of it.
thank you all the 300,000 users who downloaded a pdf from my site, if anyone wants the code, just as for it in the comments.
You're seeing this error because I think it is funny.