[urgent] Error Request fail unexpectedly

I was designing a questionnaire and suddenly the Designer doesn’t allow me to add more questions or even move the existing ones.
I’m trying to copy to another version to work on it but then a notification showed “An error occured while processing your request”.
Please advise how I can continue to work on this.

Uyen, this is usually the result of unstable internet connection, not any bug in our code.

Press [Ctrl+R] or [Ctrl+F5] in the browser to refresh the page, re-login if necessary.

If the problem constantly occurs only in one questionnaire, but you can work without this issue with another questionnaire, write to support@mysurvey.solutions how to reproduce the issue.

Best, Sergiy Radyakin