I tried my ruby out on this site : 
http://www.compileonline.com/execute_ruby_online.php

So I have this script :

roelof = "www.codewars.com#about"

def remove_url_anchor(roelof)
   answer =  roelof.gsub(/\#\w+/,"")
   puts answer
end

And it gives this wierd error message . roelof is used on several places.
So why this error message?

Roelof