Warning: mysql_connect(): The server requested authentication method unknown to the client [mysql_old_password] in /home/francaplacas/www/lib/classes/class.conexao.php on line 53

Warning: mysql_connect(): The server requested authentication method unknown to the client in /home/francaplacas/www/lib/classes/class.conexao.php on line 53

Não foi possível conectar-se ao servidor MySQL.
Erro MySQL: The server requested authentication method unknown to the client