# File lib/googleauth/application_default.rb, line 68
    def get_application_default scope = nil, options = {}
      creds = DefaultCredentials.from_env(scope, options) ||
              DefaultCredentials.from_well_known_path(scope, options) ||
              DefaultCredentials.from_system_default_path(scope, options)
      return creds unless creds.nil?
      unless GCECredentials.on_gce? options
        # Clear cache of the result of GCECredentials.on_gce?
        GCECredentials.unmemoize_all
        raise NOT_FOUND_ERROR
      end
      GCECredentials.new
    end