class Roadie::ProvidersFailed

def each_error_row(errors)
  errors.each do |error|
    case error
    when ProvidersFailed
      each_error_row(error.errors) { |row| yield row }
    when CssNotFound
      yield error.error_row
    else
      yield "Unknown provider (#{error.class}): #{error}"
    end
  end
end