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.
one thing i was always trying to figure out, is how to make lines in HTML/JS, after recently finding out about the Yahoo Pipes interface i came across this lightweight library that does the same thing, show objects are wired to each other.
WireIt is very well-documented & has some attractive examples.
You're seeing this error because I think it is funny.