uncaught exception: Call to undefined function mysql_connect()

in file: /nfs/c06/h07/mnt/90458/domains/urbancodemakers.net/html/lib/php/db/Mysql.class.php line 6
#0 /nfs/c06/h07/mnt/90458/domains/urbancodemakers.net/html/lib/poko/system/Db.class.php(21): php_db_Mysql::connect(Object(_hx_anonymous))
#1 /nfs/c06/h07/mnt/90458/domains/urbancodemakers.net/html/lib/poko/Poko.class.php(66): poko_system_Db->connect('internal-db.s90...', 'db90458_urbanco...', 'iconica', 'uTOr8UaS', NULL, '3306')
#2 /nfs/c06/h07/mnt/90458/domains/urbancodemakers.net/html/lib/site/cms/common/PageData.class.php(19): poko_Poko->getDb()
#3 /nfs/c06/h07/mnt/90458/domains/urbancodemakers.net/html/lib/site/cms/common/PageData.class.php(53): site_cms_common_PageData->loadByName('settings')
#4 /nfs/c06/h07/mnt/90458/domains/urbancodemakers.net/html/lib/site/Config.class.php(27): site_cms_common_PageData::getPageByName('settings')
#5 /nfs/c06/h07/mnt/90458/domains/urbancodemakers.net/html/lib/poko/Poko.class.php(9): site_Config->init()
#6 /nfs/c06/h07/mnt/90458/domains/urbancodemakers.net/html/lib/poko/Poko.class.php(86): poko_Poko->__construct()
#7 /nfs/c06/h07/mnt/90458/domains/urbancodemakers.net/html/index.php(9): poko_Poko::main()
#8 {main}