Unable to install activerecord in Ruby on Rails 4.1.4

Question

I am unable to install activerecord in Ruby on Rails 4.1.4.

I've added gem 'activeadmin', github: 'activeadmin' to the end of Gemfile and run bundle install . It returns 0, so I've tried to run rails g active_admin:install command, but it returns the following error:

NameError: undefined local variable or method install' for main:Object from (irb):3 from E:/software/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.4/lib/rails/commands/console.rb:90:in start' from E:/software/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.4/lib/rails/commands/console.rb:9:in start' from E:/software/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.4/lib/rails/commands/commands_tasks.rb:69:in console' from E:/software/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.4/lib/rails/commands/commands_tasks.rb:40:in run_command!' from E:/software/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.4/lib/rails/commands.rb:17:in run_command!' from E:/software/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.4/lib/rails/commands.rb:17:in ' from E:/work/projects/src/technical_support_timer/bin/rails:4:in require' from E:/work/projects/src/technical_support_timer/bin/rails:4:in ' from -e:1:in load' from -e:1:in '

Why? What am I doing wrong? How can I fix it?

Thanks in advance.

Answer 1

IRB is there for you to try out Ruby commands or snippets and see immediate responses. If you want to install or update gems, I suggest you get off IRB first by running quit and follow whatever instructions you have on your hand.