What does this error mean in the error.log?

What does this error mean in the error.log?

by David Mark Weiss -
Number of replies: 0
[Tue Jul 28 13:30:19 2009] [error] [client 67.171.115.61] File does not exist: /home/seminaryadmin/seminaryhomestudy.org/internal_error.html, referer: http://www.seminaryhomestudy.org/backup/backup.php

Does it mean that backup.php was looking for internal_error.htm?

How can I find out WHY backup.php is throwing this error?

Will pay for help.

Mark Weiss
Average of ratings: -