Trying to download existing .ASP site for client. Have browser agent set to
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0), set to override
robots.txt.

Process begins normally enough, then ends. Here's the logfile:

HTTrack3.47-27+htsswf+htsjava launched on Tue, 25 Feb 2014 10:47:03 at
www.mywebsite.com +*.png +*.gif +*.jpg +*.css +*.js -ad.doubleclick.net/*
-mime:application/foobar
(winhttrack -qwC2%Ps0u1%s%uN0%I0p3DaK0H0%kf2A25000%f#f -F "Mozilla/4.0
(compatible; MSIE 6.0; Windows NT 5.0)" -%F "<!-- Mirrored from %s%s by
HTTrack Website Copier/3.x [XR&CO'2013], %s -->" -%l "en, *" www.mywebsite.com
-O1 J:\ProFin3 +*.png +*.gif +*.jpg +*.css +*.js -ad.doubleclick.net/*
-mime:application/foobar )
Information, Warnings and Errors reported for this mirror:
note: the hts-log.txt file, and hts-cache folder, may contain sensitive
information,
 such as username/password authentication for websites mirrored in this
project
 do not share these files/folders if you want these information to remain
private
10:47:12 Warning:  Retry after error 500 (Internal Server Error) at link
www.mywebsite.com/goto.asp?LinkType=nav&LPObjID= (from
www.mywebsite.com/includes/navPS.js)
10:47:12 Warning:  Retry after error 500 () at link
www.mywebsite.com/goto.asp?LinkType=nav&LPObjID= (from
www.mywebsite.com/includes/navPS.js)
10:47:12 Error:  "" (500) after 2 retries at link
www.mywebsite.com/goto.asp?LinkType=nav&LPObjID= (from
www.mywebsite.com/includes/navPS.js)
HTTrack Website Copier/3.47-27 mirror complete in 9 seconds : 30 links
scanned, 27 files written (132429 bytes overall) [139056 bytes received at
15450 bytes/sec]
(1 errors, 2 warnings, 0 messages)

What am I missing?
TIA for your suggestions!