# File lib/dm-serializer/to_csv.rb, line 44
        def to_csv(writer = '')
          CSV.generate(writer) do |csv|
            errors.each do |key, value|
              value.each do |error|
                row = []
                row << key.to_s
                row << error.to_s
                csv << row
              end
            end
          end
        end