mode rewrite

[eluser]kosaidpo[/eluser]
hey guys
i've been stugglin with this since last night and now there's an imporvement LOL
i can say apache is tlkin to me now but sadly i dont tlk his lang
he's sayin

the server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, [email protected] 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 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.

and my application path would be /opt/lampp/htdocs/www/MyApplication

so i type in the url bar localhost/www/MyApplication

and my htaccess file

RewriteEngine on
RewriteBase /
RewriteRule ^(.*)$ /www/CI_forum/index.php/$1 [L]

tnx in advance