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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