ruby/rubygems · error · Gem::SafeMarshal::Reader::NotImplementedError

Reading Marshal objects of type extended_object is not imple

Error message

Reading Marshal objects of type extended_object is not implemented

What it means

Error "Reading Marshal objects of type extended_object is not implemented" thrown in ruby/rubygems.

Source

Thrown at lib/rubygems/safe_marshal/reader.rb:270

      end

      def read_nil
        Elements::Nil::NIL
      end

      def read_float
        string = read_bytes(read_integer)
        Elements::Float.new(string)
      end

      def read_bignum
        sign = read_byte
        data = read_bytes(read_integer * 2)
        Elements::Bignum.new(sign, data)
      end

      def read_extended_object
        raise NotImplementedError, "Reading Marshal objects of type extended_object is not implemented"
      end

      def read_class
        raise NotImplementedError, "Reading Marshal objects of type class is not implemented"
      end

      def read_module
        raise NotImplementedError, "Reading Marshal objects of type module is not implemented"
      end

      def read_class_or_module
        raise NotImplementedError, "Reading Marshal objects of type class_or_module is not implemented"
      end

      def read_data
        raise NotImplementedError, "Reading Marshal objects of type data is not implemented"
      end

View on GitHub (pinned to 86cbb817a3)

Solutions

1. The gem metadata uses a Marshal construct RubyGems does not support; rebuild the gem with a current RubyGems

When it happens

Trigger: Thrown at lib/rubygems/safe_marshal/reader.rb:270 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of ruby/rubygems@86cbb817a3 (2026-08-23). Data as JSON: /api/errors/e0b95f1c51d2bc0e. Report an issue: GitHub.