Testing out Httrack for downloading files from open directories.

For purposes of this test, I'm selecting "download separate files" as the
action & the only modification I'm making in the options is not to follow
robots.txt rules. The standard image file extensions are selected (+.gif +.jpg
+.jpeg +.png +.tif +.bmp).

Files from this link download just fine:
<http://www.bostoncourt.com/jpg/header/>

This link (just a handful of lightweight jpg files) however yields the warning
below without any files downloaded except for the index.html:
<http://www.saintarnold.com/images/beer/labels_50/>

"Warning: Warning: store text/html without scan"

What is causing the block with the second link?