Admin page got "Server Error (503)" after the update

I upgraded my CryberPanel to the new version!
The website is working normally.
But I can’t access the Sever admin page!
Can I get help in this case?

I tried the commands:
systemctl restart lsws
systemctl restart lscpd
systemctl restart mariadb

I tried the commands:

chmod -R 777 /tmp/lshttpd
systemctl restart lscpd

But things are still not okay! Please help me.