Fatal error: Uncaught Error: Class 'CDatabase' not found in /var/www/html/bitrix/modules/main/start.php:73 Stack trace: #0 /var/www/html/bitrix/modules/main/include.php(14): require_once() #1 /var/www/html/bitrix/modules/main/include/prolog_before.php(14): require_once('/var/www/html/b...') #2 /var/www/html/bitrix/modules/main/include/prolog.php(10): require_once('/var/www/html/b...') #3 /var/www/html/bitrix/header.php(1): require_once('/var/www/html/b...') #4 /var/www/html/index.php(6): require('/var/www/html/b...') #5 {main} thrown in /var/www/html/bitrix/modules/main/start.php on line 73