Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/abc/session/RoM/Waltz:Gentle_Maiden-G-64-4.abc/waltz"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1827-waltz.ps) >>/Users/jc/w/tmp/Tune-1827-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/abc/session/RoM/Waltz:Gentle_Maiden-G-64-4.abc/waltz

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_18273.log 261851 Log file, useful mostly for debugging
Coll_18276.log 263256 Log file, useful mostly for debugging
Form_18271.log 1684 Log file, useful mostly for debugging
Form_18274.log 2855 Log file, useful mostly for debugging
Form_18277.log 1684 Log file, useful mostly for debugging
Tune-1827-get.log 4115 Log file, useful mostly for debugging
Tune-1827-waltz.abc 175 ABC music file with the extracted tune(s)
Tune-1827-waltz.ps 6 PostScript
Tune-1827-waltz.txt 175 Plain-text file with the extracted tune(s)
Tune-18270-get.log 46232 Log file, useful mostly for debugging
These files should be available for 24 hours.