Rails with ruby-debugger throw 'Symbol not found: _ruby_current_thread (LoadError)'

Question

I have standard ruby-head and Rails 3.1rc4. I installed ruby-debug with following instructions from http://dirk.net/2010/04/17/ruby-debug-with-ruby-19x-and-rails-3-on-rvm/<

Answer 1

I used the gem 'debugger' which is a fork of ruby-debug(19) that works on 1.9.2 and 1.9.3 and installs easily for rvm/rbenv rubies. It makes the error disappear !