my products not found

hi my shop is http://sejavl.net78.net/

but whem i click in any button, the page reply this:

"500 Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, cpbackup@gmail.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 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request."

in my site the adress bar is: http://sejavl.net78.net/category/path/19 for button "Acessorios"

but in the demo opencart is: http://demo.opencart.com/index.php?cont ... ry&path=23


Please help me again

TAnks.

http://sejavl.net78.net/index.php?contr ... ry&path=19

You're host isn't setup properly for URL Aliasing. You can disable it from the admin area, but you also need to add this little bug fix:
http://forum.opencart.com/index.php/top ... ml#msg6829

Or if you want it to work, edit your htaccess file and try to change the RewriteBase to your subdomain.

/
to
/sejavl/

You might also try commenting out the following line like this in .htaccess if you are trying to use aliasing.  One of my servers throws up a 500 error if I leave it in ....

#Options +FollowSymlinks

Chris