Gem 'devise' error

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,

On Thursday, November 20, 2014 2:55:40 PM UTC, JP wrote:

Did you type that in the console? That line is supposed to go in your
Gemfile (and then you run bundle to install any dependencies from your
Gemfile that are not currently installed).

If you really want to install it without using bundler you would instead
run

gem install devise --version 3.0.0.rc

Lastly, it’s unlikely you actually want that exact version - the final
version of devise 3.0.0 came out some time ago (and more recent versions
have also been released)

Fred

Thank you so much