Thx for response. Jino.ru hostinf. But it,s not work on another hosting too.
And i can’t create new menu.
My advice would be to activate debug mode.
https://codex.ww.wp.xz.cn/Debugging_in_WordPress/
Once you’ve done that you check the server for a file named error_log and see what the most recent error is!!
Note: the debug log file is wp-content/debug.log
Ah, yes. I hiccuped when typing this as a result of being distracted. Sorry if I caused any confusion, lemuriec. Thank you Steve for chiming in!