ERROR - Could not load 'guard/rspec' or' ' find class Guard::Rspec
This error spent a more hours, and i found true way
$ cd $ vim Gemfile
instead of gem 'guard-rspec', '2.5.0' replace on gem 'guard-rspec', '4.6.0'
instead of gem 'rspec-rails', '2.13.1' replace on gem 'rspec-rails', '3.3.2'
And
$ bundle update $ bundle exec guard init rspec