ruby/rubygems · error · Gem::InvalidSpecificationException

#{spec.name} #{spec.version} has an invalid gemspec

Error message

#{spec.name} #{spec.version} has an invalid gemspec

What it means

Error "#{spec.name} #{spec.version} has an invalid gemspec" thrown in ruby/rubygems.

Source

Thrown at lib/bundler/installer.rb:224

      # their .gem files, so keep resolution memory around in that case.
      # The bundler spec itself is excluded because it comes from the
      # metadata source and never goes through that path.
      @definition.release_resolution_memory! if specs.none? {|s| s.default_gem? && s.source.is_a?(Source::Rubygems) }
      spec_installations = ParallelInstaller.call(self, specs, jobs, standalone, force, local: local)
      spec_installations.each do |installation|
        post_install_messages[installation.name] = installation.post_install_message if installation.has_post_install_message?
      end
    end

    def load_plugins
      Gem.load_plugins

      requested_path_gems = @definition.specs.select {|s| s.source.is_a?(Source::Path) }
      path_plugin_files = requested_path_gems.flat_map do |spec|
        spec.matches_for_glob("rubygems_plugin#{Bundler.rubygems.suffix_pattern}")
      rescue TypeError
        error_message = "#{spec.name} #{spec.version} has an invalid gemspec"
        raise Gem::InvalidSpecificationException, error_message
      end
      Gem.load_plugin_files(path_plugin_files)
      Gem.load_env_plugins
    end

    def ensure_specs_are_compatible!
      overrides = @definition.overrides
      @definition.specs.each do |spec|
        unless spec.matches_current_ruby_with_overrides?(overrides)
          raise InstallError, incompatibility_message(spec, "requires ruby version #{spec.required_ruby_version}, " \
            "which is incompatible with the current version, #{Gem.ruby_version}")
        end
        unless spec.matches_current_rubygems_with_overrides?(overrides)
          raise InstallError, incompatibility_message(spec, "requires rubygems version #{spec.required_rubygems_version}, " \
            "which is incompatible with the current version, #{Gem.rubygems_version}")
        end
      end
    end

View on GitHub (pinned to 86cbb817a3)

When it happens

Trigger: Thrown at lib/bundler/installer.rb:224 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/239f933cef70896a. Report an issue: GitHub.