Uploading issues on odkbuild

1. What is the problem? Be very detailed.
I couldn't upload my form to aggregate due to a validation error
2. What app or server are you using and on what device and operating system? Include version numbers.
3. What you have you tried to fix the problem?
Exported to XML
4. What steps can we take to reproduce the problem?

5. Anything else we should know or have? If you have a test form or screenshots or logs, attach below.

Welcome to the ODK forum, @Dolapo! We're glad you're here. When you get a chance, please introduce yourself on this forum thread. I'd also encourage you to add a picture as your avatar because it helps build community!

It sounds like you may have an issue with your syntax. The XLSForm documentation is here. When converting your form with XLSForm Online it should give details in the error message about what went wrong.

Can you share the .XLSX version of your form here? If you're using ODK Build you can got to "File" and then "Export to XLSForm".