You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: registration_error_inspector.rb
    path of file: ./repos/chef/lib/chef/formatters/error_inspectors
    
    the code of the file until where you have to start completion: require "chef-utils/dist" unless defined?(ChefUtils::Dist)

class Chef
  module Formatters
    module ErrorInspectors
      # == RegistrationErrorInspector
      # Wraps exceptions that occur during the client registration process and
      # suggests possible causes.
      #--
      # TODO: Lots of duplication with the node_load_error_inspector, just
      # slightly tweaked to talk about validation keys instead of other keys.
      class RegistrationErrorInspector
        include APIErrorFormatting

        attr_reader :exception
        attr_reader :node_name
        attr_reader :config

        def initialize(node_name, exception, config)
          @node_name = node_name
          @exception = exception
          @config = config
        end

        def add_explanation(error_description)
          case exception
          when Net::HTTPClientException, Net::HTTPFatalError
            hu
    
        def add_explanation(error_description)
          case exception
          when Net::HTTPClientException, Net::HTTPFatalError
            humanize_http_exception(error_description)
          when Errno::ECONNREFUSED, Timeout::Error, Errno::ETIMEDOUT, SocketError
            error_description.section("Network Error:", <<~E)
              There was a network error connecting to the #{ChefUtils::Dist::Server::PRODUCT}:
              #{exception.message}
            E
            error_description.section("Relevant Config Settings:", <<~E)
              chef_server_url  "#{server_url}"

              If your chef_server_url is correct, your network could be down.
            E
          when Chef::Exceptions::PrivateKeyMissing
            error_description.section("Private Key Not Found:", <<~E)
              Your private key could not be loaded. If the key file exists, ensure that it is
              readable by #{ChefUtils::Dist::Infra::PRODUCT}.
            E
            error_description.section("Relevant Config Settings:", <<~E)
              validation_key "#{api_key}"
            E
          when Chef::Exceptions::InvalidRedirect
            error_description.section("Invalid Redirect:", <<~E)
              Change your #{ChefUtils::Dist::Server::PRODUCT} location in client.rb to the #{ChefUtils::Dist::Server::PRODUCT}'s FQDN to avoid unwanted redirections.
            E
          when EOFError
            describe_eof_error(error_description)
          else
            "#{exception.class.name}: #{exception.message}"
          end
        end