Error occurs when clone a sheet that contains the image

[328]

Hi,
I have cloned the sheet in this program. ↓
but, If the clone the sheet that contains the image,
It is an error to open the xlsx.
(When you open the xlsx, dialog of the recovery message is displayed)

require 'rubyXL'

workbook = RubyXL::Parser.parse('template.xlsx')
org_sheet =  workbook['Sheet1']


for num in 3..10 do
  add_sheet = Marshal.load(Marshal.dump(org_sheet))
  add_sheet.sheet_id = num
  add_sheet.sheet_name = 'SheetName'+num.to_s
  add_sheet.workbook = workbook

  add_sheet.add_cell(0, 0, num)
  workbook.worksheets << add_sheet
end

workbook.write("outputs.xlsx")

I want to avoid errors.

[328]

Reproduction code

https://github.com/328--/rubyxl-sample

[calamo]

Hi, were you able to clone the sheet?
I'm trying to clone a basic worksheet, without images, using your code and always get the following error:

no _dump_data is defined for class Nokogiri::XML::Namespace

Is there something that I'm missing to make the code work?