menu disappear an it try to create new menu but it fails

Hello Azizm59,

Ensure that you are using the latest version of the theme installed via FTP way, clear all the caches and check the results. All the menus can be created from WordPress, Menus section from here -> https://www.screencast.com/t/rHy1J7RDeIvc Also, make sure that your system status parameters are increased according to our documentation from here -> https://forum.tagdiv.com/system-status-parameters-guide/, remove all of the untested plugins, purge CDN files and check the results. You can provide some useful screenshots with the problem if this will persists to be there.

Thanks for your understanding!