Fatal error: Uncaught TypeError: Cannot assign null to property Book::$translator of type string in /opt/app/html/includes/class/Book.php:92 Stack trace: #0 /opt/app/html/includes/class/Book.php(62): Book->pop_class() #1 /opt/app/html/index.php(321): Book->retrieve() #2 {main} thrown in /opt/app/html/includes/class/Book.php on line 92