```ruby
# encoding: utf-8
# frozen_string_literal: true

require 'chatrix/bot/plugin'

module Chatrix
  module Bot
    # Contains a number of standard plugins for the bot.
    module Plugins
    end
  end
end

require 'chatrix/bot/plugins/echo'
```

Fix module instead of class in Plugins
user
```ruby
# encoding: utf-8
# frozen_string_literal: true

require 'chatrix/bot/plugin'

module Chatrix
  class Bot
    # Contains a number of standard plugins for the bot.
    module Plugins
    end
  end
end

require 'chatrix/bot/plugins/echo'
```
assistant