rails g controllerが成功しない理由がよくわかりません、教えてほしいです!
maikit:~/projects/pictweet $ rails g controller tweets /usr/local/rvm/gems/ruby-2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/connection_specification.rb:177:in `rescue in spec': Specified 'mysql2' for database adapter, but the gem is not loaded. Add `gem 'mysql2'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord). (Gem::LoadError) from /usr/local/rvm/gems/ruby-2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_adapters/connection_specification.rb:174:in `spec' from /usr/local/rvm/gems/ruby-2.3.0/gems/activerecord-4.2.2/lib/active_record/connection_handling.rb:50:in `establish_connection' from /usr/local/rvm/gems/ruby-2.3.0/gems/activerecord-4.2.2/lib/active_record/railtie.rb:120:in `block (2 levels) in <class:Railtie>' from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.2/lib/active_support/lazy_load_hooks.rb:38:in `instance_eval' from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.2/lib/active_support/lazy_load_hooks.rb:38:in `execute_hook' from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.2/lib/active_support/lazy_load_hooks.rb:45:in `block in run_load_hooks' from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.2/lib/active_support/lazy_load_hooks.rb:44:in `each' from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.2/lib/active_support/lazy_load_hooks.rb:44:in `run_load_hooks' from /usr/local/rvm/gems/ruby-2.3.0/gems/activerecord-4.2.2/lib/active_record/base.rb:316:in `<module:ActiveRecord>' from /usr/local/rvm/gems/ruby-2.3.0/gems/activerecord-4.2.2/lib/active_record/base.rb:26:in `<top (required)>' from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.2/lib/active_support/dependencies.rb:274:in `require' from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.2/lib/active_support/dependencies.rb:274:in `block in require' from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.2/lib/active_support/dependencies.rb:240:in `load_dependency' from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.2/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:338:in `active_record_configured?' from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/application.rb:259:in `disconnect_database' from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/application.rb:97: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>'
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