При запуске
rails server вот такой ответ выдает:
xen@xen-Aspire-V3-571G:~/workspace/hello_app$ rails server
Traceback (most recent call last):
10: from bin/rails:4:in `<main>'
9: from bin/rails:4:in `require'
8: from /home/xen/.rvm/gems/ruby-2.5.1/gems/railties-4.2.0/lib/rails/commands.rb:17:in `<top (required)>'
7: from /home/xen/.rvm/gems/ruby-2.5.1/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
6: from /home/xen/.rvm/gems/ruby-2.5.1/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:73:in `server'
5: from /home/xen/.rvm/gems/ruby-2.5.1/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:123:in `require_command!'
4: from /home/xen/.rvm/gems/ruby-2.5.1/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:123:in `require'
3: from /home/xen/.rvm/gems/ruby-2.5.1/gems/railties-4.2.0/lib/rails/commands/server.rb:1:in `<top (required)>'
2: from /home/xen/.rvm/gems/ruby-2.5.1/gems/railties-4.2.0/lib/rails/commands/server.rb:1:in `require'
1: from /home/xen/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/fileutils.rb:88:in `<top (required)>'
/home/xen/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/fileutils.rb:1500:in `<module:FileUtils>': uninitialized constant FileUtils::OPT_TABLE (NameError)
Подскажите, пожалуйста, что делать?