Bad request synchronisation

I have a problem. my colleague wants to upload his submission but he received always the same problem.
the phone was for ex-college so I delete the old user and put the new account.
after that, I received this problem

Error Generic Exception; Error: Bad Request (400) at

Your post does not contain enough information for us to help. In general, the best way to get help is to fill out the questions in the pre-filled template that you get when you create a support post. So, with that in mind, can you answer these questions?

  1. What ODK tool and versions are you using? And on what device and operating system version?
  2. What steps can we take to reproduce the problem?
  3. What you have you tried to fix the problem?
  4. Anything else we should know or have? If you have a test form or screenshots or logs, please attach.

Hello @yanokwa

I did found the error, I did update for the form with an extra question, and one of the field agents didn't update the form.
he can not upload the survey already done, because the XML stricture in his phone is not the same XML in the server.