teamcapybara/capybara · error · NotImplementedError

No builder exists for selector of type #{default_format}

Error message

No builder exists for selector of type #{default_format}

What it means

Error "No builder exists for selector of type #{default_format}" thrown in teamcapybara/capybara.

Source

Thrown at lib/capybara/selector/selector.rb:102

    # @api private
    def with_filter_errors(errors)
      old_errors = @errors
      @errors = errors
      yield
    ensure
      @errors = old_errors
    end

    # @api private
    def builder(expr = nil)
      case format
      when :css
        Capybara::Selector::CSSBuilder
      when :xpath
        Capybara::Selector::XPathBuilder
      else
        raise NotImplementedError, "No builder exists for selector of type #{default_format}"
      end.new(expr)
    end

  private

    def locator_description
      locator_types.group_by { |lt| lt.is_a? Symbol }.map do |symbol, types_or_methods|
        if symbol
          "respond to #{types_or_methods.join(' or ')}"
        else
          "be an instance of #{types_or_methods.join(' or ')}"
        end
      end.join(' or ')
    end

    def locator_valid?(locator)
      return true unless locator && locator_types

View on GitHub (pinned to 15b5fdb76e)

When it happens

Trigger: Thrown at lib/capybara/selector/selector.rb:102 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of teamcapybara/capybara@15b5fdb76e (2026-08-21). Data as JSON: /api/errors/776f36c8869c81f9. Report an issue: GitHub.