ruby on rails - Spring and middleware conflict?

Question

I'm trying to add oauth2 with Google, following these instructions.

I'm receiving the following error message starting the server:

Exiting
You've tried to invoke Spring when it's already loaded (i.e. the Spring constant is defined).

This is probably because you generated binstubs with Spring 1.0, and you now have a Spring version > 1.0 on your system. To solve this, upgrade your bundle to the latest Spring version and then run `bundle exec spring binstub --all` to regenerate your binstubs. This is a one-time step necessary to upgrade from 1.0 to 1.1.

Here's the backtrace:

/Users/omonia/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.0/lib/active_support/dependencies.rb:287:in `load'
/Users/omonia/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.0/lib/active_support/dependencies.rb:287:in `block in load'
/Users/omonia/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.0/lib/active_support/dependencies.rb:259:in `load_dependency'
/Users/omonia/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.0/lib/active_support/dependencies.rb:287:in `load'
/Users/omonia/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/spring-1.7.2/lib/spring/binstub.rb:11:in `<top (required)>'
/Users/omonia/.rbenv/versions/2.3.1/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:133:in `require'
/Users/omonia/.rbenv/versions/2.3.1/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:133:in `rescue in require'
/Users/omonia/.rbenv/versions/2.3.1/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:40:in `require'
/Users/omonia/Dropbox/MyApp/bin/spring:13:in `<top (required)>'

The related gems installed:

gem 'google-api-client', '0.9'
gem 'omniauth'
gem 'omniauth-google_oauth2'

The following code is added to config/initializers/omniauth.rb:

Rails.application.config.middleware.use OmniAuth::Builder do
  provider :google_oauth2, 'my Google client id', 'my Google client secret', {client_options: {ssl: {ca_file: Rails.root.join("cacert.pem").to_s}}}
end

What is going on here? Following the error instructions doesn't change anything (Spring is of latest version 1.7.2 and running bundle exec spring binstub --all only returns "spring already present").

Answer 1

Putting my comment as answer, because OP confirmed that it did help him. Follow the steps below to install the new Spring and resolve the issue:

• run this bin/spring binstub --remove --all
• remove the gem from Gemfile and run bundle install.
• Now add the gem "spring", group: :development in Gemfile, run bundle install and bundle exec spring binstub --all following doc. Now all should be fine.