Warning: mysql_connect(): The server requested authentication method unknown to the client [mysql_old_password] in /home/ciac/public_html/villazon/conecta.inc on line 2

Warning: mysql_connect(): The server requested authentication method unknown to the client in /home/ciac/public_html/villazon/conecta.inc on line 2
I cannot connect to the database because: The server requested authentication method unknown to the client