Soluções de problemas + transferencia de domínio

Preciso das seguintes soluções:

1. Fiz um site no wordpress com um domínio.com no GoDaddy. Preciso
mudar o domínio para outro endereço o qual foi registrado no registro.br


2.
O site www.cirurgiaeanestesio.com apresenta mostra o seguinte erro:

Warning: Class __PHP_Incomplete_Class has no unserializer in /home/content/p3pnexwpnas08_data01/19/3848319/html/wp-content/object-cache.php on line 894

Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /home/content/p3pnexwpnas08_data01/19/3848319/html/wp-content/object-cache.php:894) in /home/content/p3pnexwpnas08_data01/19/3848319/html/wp-content/plugins/wp-clone-template/main.php on line 119

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /home/content/p3pnexwpnas08_data01/19/3848319/html/wp-content/object-cache.php:894) in /home/content/p3pnexwpnas08_data01/19/3848319/html/wp-content/plugins/wp-clone-template/main.php on line 119