Hi, I am trying to install Devise but I am getting this error : gem 'devise', '~> 3.0.0.rc' ERROR: While executing gem ... (Gem::CommandLineError) Unknown command devise, ------------------------------- Thanks -- 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+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/14ede1e3-3aa6-4d4e-b900-31a02508d938%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.