Сообщение об ошибке

• Warning: Use of undefined constant REQUEST_URI - assumed 'REQUEST_URI' (this will throw an Error in a future version of PHP) в функции include() (строка 30 в файле /var/www/www-root/data/www/premiumtravel.kz/sites/all/themes/premiumtravel/html.tpl.php).
• Warning: Cannot modify header information - headers already sent by (output started at /var/www/www-root/data/www/premiumtravel.kz/includes/common.inc:2861) в функции drupal_send_headers() (строка 1557 в файле /var/www/www-root/data/www/premiumtravel.kz/includes/bootstrap.inc).
• PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: SELECT 1 AS expression FROM {variable} variable WHERE ( (name = :db_condition_placeholder_0) ); Array ( [:db_condition_placeholder_0] => cron_last ) в функции variable_set() (строка 1316 в файле /var/www/www-root/data/www/premiumtravel.kz/includes/bootstrap.inc).