The page that's throwing it is "/". So you want to look at what your index file is in your document root (index.php
for example). Additionally, make sure that the log is for a site that you have setup correctly (e.g. not default vhost).
If you have multiple vhosts, you may want to create a custom log file for each vhost so you know which one it is that is returning a 500 error. It would be the directives: TransferLog
and ErrorLog
.