Okay, I tried that. I uninstalled all previous version of ruby with rvm. Now the only version of ruby on my machine is 2.0: sean@ubuntu:~/ruby$ rvm list
rvm rubies =* ruby-2.0.0-p0 [ i686 ] # => - current # =* - current && default # * - default sean@ubuntu:~/ruby$ But, it's still not working. I also tried uninstalling and reinstalling rails4 through gem. Now rails 4 is the only version of rails on my machine. I think next I'll try uninstalling rake. Maybe it's rake. Thanks anyway. -- Posted via http://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to rubyonrails-talk+unsubscr...@googlegroups.com. To post to this group, send email to rubyonrails-talk@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/4b1934e4c13d20cecf9fe9caa06386af%40ruby-forum.com?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.