This is the text of the error I'm getting. I tried deleting robots.txt and got
the same result.

* * MIRROR ERROR! * *
HTTrack has detected that the current mirror is empty. If it was an update,
the previous mirror has been restored.
Reason: the first page(s) either could not be found, or a connection problem
occurred.
= > Ensure that the website still exists, and/or check your proxy settings! <
=