Warning: require_once(Doctrine/Common/ClassLoader.php): failed to open stream: No such file or directory in /var/www/html/vendor/doctrine/orm/bin/doctrine-pear.php on line 20

Fatal error: require_once(): Failed opening required 'Doctrine/Common/ClassLoader.php' (include_path='.:/usr/local/lib/php') in /var/www/html/vendor/doctrine/orm/bin/doctrine-pear.php on line 20