Warning: require_once(/var/www/html/bitrix/modules/main/include/prolog.php): failed to open stream: No such file or directory in /var/www/html/bitrix/header.php on line 1

Fatal error: require_once(): Failed opening required '/var/www/html/bitrix/modules/main/include/prolog.php' (include_path='.:/usr/local/lib/php') in /var/www/html/bitrix/header.php on line 1