Suddenly cannot access to database on phpmyadmin

I have a warning like --> " Warning: mysqli::__construct(): (HY000/2002): Connection refused in /opt/lampp/htdocs/tokoonline/admin/login.php on line 4"

and some error when i access phpmyadmin.

i guest that it because django server that i run before it. but ijust don't know.

ps: there is no problem like this before. so there is no problem with my code.

When i access to phpmyadmin

When i access to my website

so what i have to do to solve this. thanks before...