Multiple Choice Error

This permalink:

http://www.adamsweb.us/blog/some-innocence-is-more-equal-than-others/

Is giving me this error:

Multiple Choices
The document name you requested (/index.php) could not be found on this server. However, we found documents with names similar to the one you requested.

Available documents.

What’s going on?

I’ve tried resaving my permalink settings.