fluent/fluentd · error · ArgumentError

#{name}: both of block and type cannot be specified

Error message

#{name}: both of block and type cannot be specified

What it means

Error "#{name}: both of block and type cannot be specified" thrown in fluent/fluentd.

Source

Thrown at lib/fluent/config/configure_proxy.rb:255

          when :list
            raise ArgumentError, ":list is valid only for :enum type, but #{type}: #{name}" if type != :enum
          when :value_type
            raise ArgumentError, ":value_type is valid only for :hash and :array, but #{type}: #{name}" if type != :hash && type != :array
          when :symbolize_keys
            raise ArgumentError, ":symbolize_keys is valid only for :hash, but #{type}: #{name}" if type != :hash
          else
            raise ArgumentError, "unknown option '#{key}' for configuration parameter: #{name}"
          end
        end
      end

      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)

View on GitHub (pinned to dd45c6e18d)

When it happens

Trigger: Thrown at lib/fluent/config/configure_proxy.rb:255 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/a00cdf9fd894f0b1. Report an issue: GitHub.