rails tutorial に取り組んでいるのですが
第4章｛4.2.1｝でrails consoleが起動できず困っています。
https://railstutorial.jp/chapters/rails_flavored_ruby?version=5.1#cha-rails_flavored_ruby
Cloud9上でrails console を入力すると
ec2-user:~/environment/sample_app (rails-flavored-ruby) $ rails c
Running via Spring preloader in process 8213
Loading development environment (Rails 5.1.4)
/usr/local/rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/irb/init.rb:24:in `setup': Undefined prompt mode(SAMPLE). (IRB::UndefinedPromptMode)
from /usr/local/rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/irb.rb:378:in `start'
from /usr/local/rvm/gems/ruby-2.4.1/gems/railties-5.1.4/lib/rails/commands/console/console_command.rb:62:in `start'
from /usr/local/rvm/gems/ruby-2.4.1/gems/railties-5.1.4/lib/rails/commands/console/console_command.rb:17:in `start'
from /usr/local/rvm/gems/ruby-2.4.1/gems/railties-5.1.4/lib/rails/commands/console/console_command.rb:97:in `perform'
from /usr/local/rvm/gems/ruby-2.4.1@global/gems/thor-0.20.0/lib/thor/command.rb:27:in `run'
from /usr/local/rvm/gems/ruby-2.4.1@global/gems/thor-0.20.0/lib/thor/invocation.rb:126:in `invoke_command'
from /usr/local/rvm/gems/ruby-2.4.1@global/gems/thor-0.20.0/lib/thor.rb:387:in `dispatch'
from /usr/local/rvm/gems/ruby-2.4.1/gems/railties-5.1.4/lib/rails/command/base.rb:63:in `perform'
from /usr/local/rvm/gems/ruby-2.4.1/gems/railties-5.1.4/lib/rails/command.rb:44:in `invoke'
from /usr/local/rvm/gems/ruby-2.4.1/gems/railties-5.1.4/lib/rails/commands.rb:16:in `<top (required)>'
from /usr/local/rvm/gems/ruby-2.4.1/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `require'
from /usr/local/rvm/gems/ruby-2.4.1/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `block in require'
from /usr/local/rvm/gems/ruby-2.4.1/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:258:in `load_dependency'
from /usr/local/rvm/gems/ruby-2.4.1/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `require'
from /home/ec2-user/environment/sample_app/bin/rails:9:in `<top (required)>'
from /usr/local/rvm/gems/ruby-2.4.1/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:286:in `load'
from /usr/local/rvm/gems/ruby-2.4.1/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:286:in `block in load'
from /usr/local/rvm/gems/ruby-2.4.1/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:258:in `load_dependency'
from /usr/local/rvm/gems/ruby-2.4.1/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:286:in `load'
from /usr/local/rvm/rubies/ruby-2.4.1/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /usr/local/rvm/rubies/ruby-2.4.1/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from -e:1:in `<main>'
上記のように表示されます。
一度spring stop を実行し、再度rails consoleを試しても同様の結果でした。
補足のspring statusです。
ec2-user:~/environment/sample_app (rails-flavored-ruby) $ spring status
Spring is running:
8072 spring server | sample_app | started 40 mins ago
Warning: bad syntax, perhaps a bogus '-'? See /usr/share/doc/procps-3.2.8/FAQ
8075 spring app | sample_app | started 40 mins ago | development mode
どなたかアドバイスいただければ幸いです。