I installed Wallpaper Script on my small domain however it gives this error around the page :

The server experienced an interior error or misconfiguration and was not able to accomplish your request.

Please contact the server administrator, [no address given] and tell them of times the mistake happened, and anything you may have done that could have triggered the mistake.

More details relating to this error might be obtainable in the server error log.

Can anybody help? Website is http://hotwallpapers.pk

Sounds somewhat Apache error caused by a malformed or else invalid .htaccess file. I suggest checking your error.log file, wherever it resides. /var/log/httpd/error.log in certain distributions.)