Warning: require_once(Zend/Loader.php): Failed to open stream: No such file or directory in /var/www/html/Zend/Db.php on line 27

Fatal error: Uncaught Error: Failed opening required 'Zend/Loader.php' (include_path='.:/usr/local/lib/php') in /var/www/html/Zend/Db.php:27 Stack trace: #0 {main} thrown in /var/www/html/Zend/Db.php on line 27