Laminas session error

I have this two warning after login

**Warning**: session_start(): Session object destruction failed in **/home/sviluppo/vendor/laminas/laminas-session/src/SessionManager.php** on line **144**

**Warning**: session_start(): Failed to decode session object. Session has been destroyed in **/home/sviluppo/vendor/laminas/laminas-session/src/SessionManager.php** on line **144**

and after this error:

Fatal error: Uncaught TypeError: Typed property Base\Utils\*****SessionManager\Azienda::$azienda must be an instance of Auth\Entity\Azienda, __PHP_Incomplete_Class used in /home/*****/vendor/laminas/laminas-stdlib/src/ArrayObject.php:422 Stack trace: #0 /home/*****/vendor/laminas/laminas-stdlib/src/ArrayObject.php(422): unserialize() #1 [internal function]: Laminas\Stdlib\ArrayObject->unserialize() #2 /home/*****/vendor/laminas/laminas-session/src/SessionManager.php(144): session_start() #3 /home/*****/module/Application/src/Module.php(78): Laminas\Session\SessionManager->start() #4 /home/*****/module/Application/src/Module.php(62): Application\Module->bootstrapSession() #5 /home/*****/vendor/laminas/laminas-eventmanager/src/EventManager.php(331): Application\Module->onBootstrap() #6 /home/*****/vendor/laminas/laminas-eventmanager/src/EventManager.php(180): Laminas\EventManager\EventManager->triggerListeners() #7 /home/*****/vendor/laminas/laminas-mvc/src/Application.php(160): Laminas\EventManager in /home/*****/vendor/laminas/laminas-stdlib/src/ArrayObject.php on line 422

i think the problem is due to the session file not being written on /var/lib/php/session/… but i don’t understand why ??
If I test manually with this code, the session file was written

<?php
session_start();
$_SESSION['newsession'] = 'test';
?>