Problem with hestiacp

Hello, I am new to the forum and I enter to ask for help with a problem I have with hestiacp.

When I try to enter my control panel with my ip, it does not let me enter, I put username and password, but it does not give an error or anything, it returns me again to enter the user.

In the myphpadmin address, to enter my database, it gives me this error when trying to enter:

phpMyAdmin - Error

Error during session start; please check your PHP and/or webserver log file and configure your PHP installation properly. Also ensure that cookies are enabled in your browser.

session_start(): open(SESSION_FILE, O_RDWR) failed: Read-only file system (30)

session_start(): Failed to read session data: files (path: /var/lib/php/sessions)

And I have tried to restart from the hestiacp console and now it gives me this error when I try to start the hestiacp service:

Job for hestia.service failed because the control process exited with error code.
See “systemctl status hestia.service” and “journalctl -xe” for details.

and

● hestia.service - LSB: starts the hestia control panel
Loaded: loaded (/etc/init.d/hestia; generated)
Active: failed (Result: exit-code) since Thu 2020-12-03 22:33:09 CET; 43s ago
Docs: man:systemd-sysv-generator(8)
Process: 2632 ExecStop=/etc/init.d/hestia stop (code=exited, status=0/SUCCESS)
Process: 9286 ExecStart=/etc/init.d/hestia start (code=exited, status=1/FAILURE)

Any suggestion of what the problem is? Thank you.

Check your server disk, it is full or has been remounted re-only for some reason