PHP error [Warning]

URI: index.php?mylang=english
Path: tdoo.com/includes/Core/locale.php
Line: 200
php_uname() has been disabled for security reasons

PHP Error [Warning]

URI: index.php?option=com_contact&task=view&contact_id=1&Itemid=86
Path: tdoo.com/includes/Core/elxis.php
Line: 490
Cannot modify header information - headers already sent by (output started at /home/sequentd/public_html/sequentdoo.com/includes/Core/database.php:37)