Session File Handler

Code:

app.sessionSavePath = NULL

Your session save path is null. You have to set the directory.

In fact, in Config/App.php it is already set to the default location in the writable folder:

PHP Code:

public $sessionSavePath = WRITEPATH . 'session'; 


Don't overwrite it in the .env file, or set the right path in the .env file, but it cannot be null.