fluent/fluentd · error · ArgumentError

#{name}: enum parameter requires :list of Symbols

Error message

#{name}: enum parameter requires :list of Symbols

What it means

Error "#{name}: enum parameter requires :list of Symbols" thrown in fluent/fluentd.

Source

Thrown at lib/fluent/config/configure_proxy.rb:278

        opts[:type] = type
        opts.merge!(kwargs)

        begin
          block ||= @type_lookup.call(type)
        rescue ConfigError
          # override error message
          raise ArgumentError, "#{name}: unknown config_argument type `#{type}'"
        end

        # options for config_param
        option_value_type!(name, opts, :desc, String)
        option_value_type!(name, opts, :alias, Symbol)
        option_value_type!(name, opts, :secret, type: :boolean)
        option_value_type!(name, opts, :deprecated, String)
        option_value_type!(name, opts, :obsoleted, String)
        if type == :enum
          if !opts.has_key?(:list) || !opts[:list].is_a?(Array) || opts[:list].empty? || !opts[:list].all?(Symbol)
            raise ArgumentError, "#{name}: enum parameter requires :list of Symbols"
          end
        end
        option_value_type!(name, opts, :symbolize_keys, type: :boolean)
        option_value_type!(name, opts, :value_type, Symbol) # hash, array
        option_value_type!(name, opts, :skip_accessor, type: :boolean)

        if opts.has_key?(:default)
          config_set_default(name, opts[:default])
        end

        if opts.has_key?(:desc)
          config_set_desc(name, opts[:desc])
        end

        if opts[:deprecated] && opts[:obsoleted]
          raise ArgumentError, "#{name}: both of deprecated and obsoleted cannot be specified at once"
        end

View on GitHub (pinned to dd45c6e18d)

When it happens

Trigger: Thrown at lib/fluent/config/configure_proxy.rb:278 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of fluent/fluentd@dd45c6e18d (2026-08-21). Data as JSON: /api/errors/377c8b1ebdc7748f. Report an issue: GitHub.