Fatal error: Uncaught exception Error with message Call to undefined function mysql_connect() thrown in /home/www/system/drivers/DB_Mysql.php on line 74

#0 /home/www/system/libraries/Database.php(74): DB_Mysql->connect()
#1 /home/www/system/libraries/Database.php(136): Database->__construct()
#2 /home/www/system/libraries/System.php(147): Database::getInstance()
#3 /home/www/system/libraries/Model.php(86): System->import('Database')
#4 /home/www/system/modules/frontend/FrontendUser.php(91): Model->__construct()
#5 /home/www/system/modules/frontend/FrontendUser.php(173): FrontendUser->__construct()
#6 /home/www/system/libraries/System.php(147): FrontendUser::getInstance()
#7 /home/www/index.php(59): System->import('FrontendUser', 'User')
#8 /home/www/index.php(320): Index->__construct()
#9 {main}