Cannot add questionnaire to local server

We used the server version 21.01.5 (build 30686).
When I try to upload the new questionnaire to our server following error occurred.
Designer unavailable. Please make sure that the Designer is not in the maintenance mode

Hello @sandeepbhujbal ,

From the screenshot it follows that communication with the Designer is working (since we see stats on the number of questions/rosters in the selected questionnaire).

Could you please generate a PDF of the questionnaire in the Designer and share here?

Thank you, Sergiy

Could you try to import it again? Changes we made to address this issue.

Hello @vitalii and @sergiy.
I have successfully imported the questionary to my server.
thank you for your support.