'         from C:/RailsInstaller/Ruby0.0.0/lib/ruby/0.0.0/tsort.rb:000:in `block i n each_strongly_connected_component'         from C:/RailsInstaller/Ruby0.0.0/lib/ruby/0.0.0/tsort.rb:000:in `each'         from C:/RailsInstaller/Ruby0.0.0/lib/ruby/0.0.0/tsort.rb:000:in `each_st rongly_connected_component'         from C:/RailsInstaller/Ruby0.0.0/lib/ruby/0.0.0/tsort.rb:000:in `