If you are on the kf.kobotoolbox.org server, this may have been caused by a deployment done earlier today. Do you still have the issue if you log out and log back in again?
Thank you Jnm for the response, Indeed, I am on [kf.kobotoolbox.org server. I was afraid of loosing my unsaved work but it appears I have no choice than to log out and login again. The error message changed though to:
Error saving form
Your changes could not be saved, likely because of a lost internet connection. Keep this window open and try saving again while using a better connection.
After logging out and logging in again, the issue is resolved and I can now save the form. However, this has happened at the cost of loosing all that I had already worked upon.
Maybe you could download your survey project in the xlsform (and make a backup so that you do not lose the questionnaire that you have prepared so far) as outlined previously:
Sorry to hear that. Did you try logging out and back in again with a different tab in the same browser? If the form still wouldn’t save after doing that, and you had to reload the tab where you were editing the form, then that’s a problem we would like to fix.