application error - how can I debug this?

[tedsalt]

I'm getting the following error when I select attributes -

 

Internal Server Error

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

 

error log shows -

 

[sun Sep 3 14:45:28 2006] [error] [client 24.31.249.123] File does not exist: /home/freshroa/public_html/500.shtml

[sun Sep 3 14:45:28 2006] [error] [client 24.31.249.123] Premature end of script headers: /home/freshroa/public_html/product_info.php

 

how can I debug this?

 

TIA-

ted