new

# File actionpack/lib/action_dispatch/middleware/session/abstract_store.rb, line 12
      def initialize(const_error)
        @original_exception = const_error

        super("Session contains objects whose class definition isn't available.\n" +
          "Remember to require the classes for all objects kept in the session.\n" +
          "(Original exception: #{const_error.message} [#{const_error.class}])\n")
      end