ruby/rubygems · error · Bundler::GemNotFound

Could not find gem '#{missing_gem_name}'.

Error message

Could not find gem '#{missing_gem_name}'.

What it means

Error "Could not find gem '#{missing_gem_name}'." thrown in ruby/rubygems.

Source

Thrown at lib/bundler/cli/binstubs.rb:37

      installer_opts = {
        force: options[:force],
        binstubs_cmd: true,
        all_platforms: options["all-platforms"],
      }

      if options[:all]
        raise InvalidOption, "Cannot specify --all with specific gems" unless gems.empty?
        @gems = Bundler.definition.specs.map(&:name)
        installer_opts.delete(:binstubs_cmd)
      elsif gems.empty?
        Bundler.ui.error "`bundle binstubs` needs at least one gem to run."
        exit 1
      end

      gems.each do |gem_name|
        spec = Bundler.definition.specs.find {|s| s.name == gem_name }
        unless spec
          raise GemNotFound, Bundler::CLI::Common.gem_not_found_message(
            gem_name, Bundler.definition.specs
          )
        end

        if options[:standalone]
          if gem_name == "bundler"
            Bundler.ui.warn("Sorry, Bundler can only be run via RubyGems.") unless options[:all]
            next
          end

          Bundler.settings.temporary(path: Bundler.settings[:path] || Bundler.root) do
            installer.generate_standalone_bundler_executable_stubs(spec, installer_opts)
          end
        else
          installer.generate_bundler_executable_stubs(spec, installer_opts)
        end
      end
    end

View on GitHub (pinned to 86cbb817a3)

When it happens

Trigger: Thrown at lib/bundler/cli/binstubs.rb:37 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/a3930c6561df5d72. Report an issue: GitHub.