Ruby on Rails

I was going through tutorials in railstutorail.org. And I came up with
users password using bycrypt I add the gem 'bcrypt', '3.1.7' line in
gemfile
now when I update it say :
LoadError: cannot load such file -- 2.2/bcrypt_ext
And When ever I try to run bundle update command it say
The system cannot find the path specified.
How to solve it

--
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+unsubscribe@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/680c7c4a27e57e1dc7dd7138402277e4%40ruby-forum.com.
For more options, visit https://groups.google.com/d/optout.