Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/DftY/24CountryDances_1801_Preston.abc/1801"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-11986-1801.ps) >>/Users/jc/w/tmp/Tune-11986-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/DftY/24CountryDances_1801_Preston.abc/1801

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_11986.log 507729 Log file, useful mostly for debugging
Tune-11986-1801.abc 170 ABC music file with the extracted tune(s)
Tune-11986-1801.ps 6 PostScript
Tune-11986-1801.txt 170 Plain-text file with the extracted tune(s)
Tune-11986-get.log 4083 Log file, useful mostly for debugging
These files should be available for 24 hours.