Warning: mysql_connect(): The server requested authentication method unknown to the client [mysql_old_password] in /home/smartish/public_html/admin/includes/db_connect.php on line 12

Warning: mysql_connect(): The server requested authentication method unknown to the client in /home/smartish/public_html/admin/includes/db_connect.php on line 12
I cannot connect to the database because: The server requested authentication method unknown to the client