Failed to fetch the dynamic data form

Hi team, i’m trying to work on my dynamic data project, but today it doesn’t work anymore. I have checked gain the round 2 survey from this link Dynamic Data Attachments — KoboToolbox documentation but it also didn’t work. When i validate the form in it shows the message below

please help me to check this issue
Thanks a lot

@manh_nguyen, you will need to check out the variable name xml-external you have provided to your child form. The issue should be there.

I just dowloaded the example from the article, I didn’t change anything and it still didn’t work here ODK - XLSForm Online v2.x

I found my mistake. The child excel form cannot be validated on ODK - XLSForm Online v2.x. And when I create a new child project, I cannot see the preview form before I connect with other project in settings. I’m sorry for taking your time and thank you for your patient.

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@manh_nguyen, :clap: :heart: :partying_face: Thank you also for sharing the solution with the entire community! This should be helpful :tada: