Hi @Raul_Fretel_Malparti and welcome to the community! Thanks for adding a picture. We're glad you're here. When you get a chance, please introduce yourself on this forum thread.
We need some more details to help you.
- Are you able to share the XLSForm file here?
- Is the problem when adding the form to your server?
- Are you using ODK Aggregate or ODK Central? What version?
- What is the error message?
- Is the problem when opening the form on your device?
- What version of ODK Collect are you using?
- What device (brand and model) are you using? What version of Android?
- What is the error message? Or, what is the problem that is happening?