Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/ONeills/Rare_Small/0171_Quick_Step_Fencibles.abc/book0"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3396-book0.ps) >>/Users/jc/w/tmp/Tune-3396-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/ONeills/Rare_Small/0171_Quick_Step_Fencibles.abc/book0

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_33960.log 271686 Log file, useful mostly for debugging
Coll_33964.log 263256 Log file, useful mostly for debugging
Coll_33965.log 263256 Log file, useful mostly for debugging
Coll_33966.log 264661 Log file, useful mostly for debugging
Coll_33968.log 261851 Log file, useful mostly for debugging
Tune-3396-book0.abc 182 ABC music file with the extracted tune(s)
Tune-3396-book0.ps 6 PostScript
Tune-3396-book0.txt 182 Plain-text file with the extracted tune(s)
Tune-3396-get.log 4157 Log file, useful mostly for debugging
Tune-33968-get.log 5635 Log file, useful mostly for debugging
These files should be available for 24 hours.