C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require': no such file to load -- C:/ruby/lib/ruby/gems/ 1.8/gems/mongrel-1.1.2-x86-mswin32/lib/mongrel/init.rb (MissingSourceFile) I did 'gem update mongrel' and it said : Successfully installed mongrel-1.1.5-x86-mswin32-60 I noticed the version of the one installed is later than the one in the mongrel error message. Is there an older version of something that is causing this?
I solved this by the following way
by changing the name of your folder C:/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60 to C:/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32
and it should work as usual