rails generate devise:install does nothing

Question

A have a problem installing the gem devise. I've already run bundle install but when I run rails generate devise:install, there were no errors and it just does nothing.

My rails version is Rails 4.2.5.
My ruby version is ruby 2.2.1p85 (2015-02-26 revision 49769) [x86_64-darwin14].

Thanks!

UPDATE!

Problem solved, I just restarted my machine. It works now.

Answer 1

In case this ever happens again, all you would have to do is run:

$ spring stop

Your generators will stop hanging & go back to normal.