Ruby on Rails invalid byte sequence in UTF-8 (ArgumentError)

Question

When I running command

rails generate mongoid:config

or

rails generate rspec:install

I am getting this error - match: invalid byte sequence in UTF-8 (ArgumentError)
I tried those gems:

gem 'rack-utf8_sanitizer'
gem "handle_invalid_percent_encoding_requests"
gem 'utf8-cleaner'

They do not help! I am using macbook OSX 10.9 How can I fix it? I am using ruby 2.1.2 and I make app by rails new myapp and I have not change anything yet in the code.

Answer 1

I found what was the problem! It was a gem 'spring' which automatically adds to Gemfile when you run: rails new myapp. To avoid this problem you need to run: rails new myapp --skip-spring
I found answer here: Rails Spring breaking generators