PHP Error [Warning]

URI: index.php?mylang=english
Path: /includes/adodb/drivers/adodb-mysql.inc.php
Line: 364
mysql_connect(): Headers and client library minor version mismatch. Headers:100337 Library:30120

PHP Error [Warning]

URI: index.php?option=com_contact&task=view&contact_id=1&Itemid=74
Path: /includes/Core/elxis.php
Line: 466
Cannot modify header information - headers already sent by (output started at /home/srvsited/public_html/DOMAINS/ks-net.gr/includes/Core/database.php:37)

PHP Error [Warning]

URI: index.php?option=com_contact&task=view&contact_id=1&Itemid=74
Path: /includes/Core/elxis.php
Line: 3276
Cannot modify header information - headers already sent by (output started at /home/srvsited/public_html/DOMAINS/ks-net.gr/includes/Core/database.php:37)