Internal Server Error

Amigos,bom dia!!,estou com este problema,quando tento acessar o admin,pelo link,esta me dando este erro:

Internal Server ErrorThe server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, webmaster@amadoamante.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

andei pesquisando,me parece que é no

.htaccess

 

.htpasswd

mas ñ sei como resolver,

Meu .htaccess

esta assim :

AuthUserFile /home/public_html/admin/.htpasswd
AuthGroupFile /dev/null
AuthName "AMADO AMANTE"
AuthType Basic
<Limit GET>
require user XIM
</Limit>
php_flag register_globals on

e Meu .htpasswd
esta assim :

XIM:$1$HnqCj/Q.$vPE/EtBBSbxHOTzNMp6qM0

se puderem me ajudar ficarei agradecido,um forte abraço a todos.