DEPRECATION WARNINGのエラーの対処方法

Question

ターミナル上でrails g controllerコマンドを実行しようとしたのですが以下のようなエラーコードがでてしまいます、、、
原因がいまいちつかめず困っているのですがどなたか買い消す方法を教えていただけませんか＞＜

DEPRECATION WARNING: Sprockets method `register_engine` is deprecated.
Please register a mime type using `register_mime_type` then
use `register_compressor` or `register_transformer`.
https://github.com/rails/sprockets/blob/master/guides/extending_sprockets.md#supporting-all-versions-of-sprockets-in-processors
 (called from block in <class:Railtie> at /usr/local/rvm/gems/ruby-2.3.0/gems/less-rails-2.7.1/lib/less/rails/railtie.rb:15)
DEPRECATION WARNING: You are using the a deprecated processor interface Less::Rails::ImportProcessor.
Please update your processor interface:
https://github.com/rails/sprockets/blob/master/guides/extending_sprockets.md#supporting-all-versions-of-sprockets-in-processors
 (called from block in <class:Railtie> at /usr/local/rvm/gems/ruby-2.3.0/gems/less-rails-2.7.1/lib/less/rails/railtie.rb:20)
/usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.7/lib/active_support/dependencies.rb:268:in `load': /home/ubuntu/workspace/reewin/config/routes.rb:65: syntax error, unexpected keyword_end, expecting end-of-input (SyntaxError)
        from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.7/lib/active_support/dependencies.rb:268:in `block in load'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.7/lib/active_support/dependencies.rb:240:in `load_dependency'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.7/lib/active_support/dependencies.rb:268:in `load'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.2.7/lib/rails/application/routes_reloader.rb:40:in `block in load_paths'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.2.7/lib/rails/application/routes_reloader.rb:40:in `each'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.2.7/lib/rails/application/routes_reloader.rb:40:in `load_paths'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.2.7/lib/rails/application/routes_reloader.rb:16:in `reload!'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.2.7/lib/rails/application/routes_reloader.rb:26:in `block in updater'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.7/lib/active_support/file_update_checker.rb:75:in `execute'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.2.7/lib/rails/application/routes_reloader.rb:27:in `updater'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.2.7/lib/rails/application/routes_reloader.rb:7:in `execute_if_updated'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.2.7/lib/rails/application/finisher.rb:69:in `block in <module:Finisher>'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.2.7/lib/rails/initializable.rb:30:in `instance_exec'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.2.7/lib/rails/initializable.rb:30:in `run'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.2.7/lib/rails/initializable.rb:55:in `block in run_initializers'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:228:in `block in tsort_each'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:431:in `each_strongly_connected_component_from'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:349:in `block in each_strongly_connected_component'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:347:in `each'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:347:in `call'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:347:in `each_strongly_connected_component'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:226:in `tsort_each'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:205:in `tsort_each'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.2.7/lib/rails/initializable.rb:54:in `run_initializers'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.2.7/lib/rails/application.rb:352:in `initialize!'
        from /home/ubuntu/workspace/reewin/config/environment.rb:5:in `<top (required)>'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.7/lib/active_support/dependencies.rb:274:in `require'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.7/lib/active_support/dependencies.rb:274:in `block in require'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.7/lib/active_support/dependencies.rb:240:in `load_dependency'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.7/lib/active_support/dependencies.rb:274:in `require'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/application.rb:92:in `preload'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/application.rb:143:in `serve'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/application.rb:131:in `block in run'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/application.rb:125:in `loop'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/application.rb:125:in `run'
        from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/application/boot.rb:19:in `<top (required)>'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from -e:1:in `<main>'

Answer 1

まず、WARNINGなのでエラーではなく、放置しても動くことは動きます。

原因としてはこちらと同様、Sprocketsが3.7に上がったことで、古い書き方に対して警告が出る状態となっているものと思われます。

less-railsのissueも進捗がないので、メッセージを消すには「Sprocketsを3.6系列まで戻す」というのが応急措置になります。