Error connecting to database - check your database connection properties in the constants.php file!

SQLSTATE[08004] [1040] Too many connections
PHP Version : 7.4.3-4ubuntu2.23

Warning: PDO::prepare(): SQLSTATE[00000]: No error: PDO constructor was not called in /var/www/xcc/admin/includes/Session.php on line 560

Fatal error: Uncaught Error: Call to a member function execute() on null in /var/www/xcc/admin/includes/Session.php:561 Stack trace: #0 /var/www/xcc/admin/includes/Session.php(62): Session->addActiveGuest() #1 /var/www/xcc/admin/includes/Session.php(28): Session->startSession() #2 /var/www/xcc/admin/includes/controller.php(28): Session->__construct() #3 /var/www/xcc/tasks.php(13): include('/var/www/xcc/ad...') #4 {main} thrown in /var/www/xcc/admin/includes/Session.php on line 561

Warning: Unknown: write failed: No space left on device (28) in Unknown on line 0

Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/lib/php/sessions) in Unknown on line 0