Warning: require_once(/var/www/wordpress/wp-load.php): failed to open stream: Cannot allocate memory in /var/www/wordpress/wp-blog-header.php on line 13

Fatal error: require_once(): Failed opening required '/var/www/wordpress/wp-load.php' (include_path='.:/usr/local/lib/php') in /var/www/wordpress/wp-blog-header.php on line 13