fluent/fluentd · error · ArgumentError

#{name}: unknown config_argument type `#{type}'

Error message

#{name}: unknown config_argument type `#{type}'

What it means

Error "#{name}: unknown config_argument type `#{type}'" thrown in fluent/fluentd.

Source

Thrown at lib/fluent/config/configure_proxy.rb:267

      def parameter_configuration(name, type = nil, **kwargs, &block)
        config_parameter_option_validate!(name, type, **kwargs, &block)

        name = name.to_sym

        if block && type
          raise ArgumentError, "#{name}: both of block and type cannot be specified"
        elsif !block && !type
          type = :string
        end
        opts = {}
        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)

View on GitHub (pinned to dd45c6e18d)

When it happens

Trigger: Thrown at lib/fluent/config/configure_proxy.rb:267 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/1ff13e3a9143c3d3. Report an issue: GitHub.