Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1800/AbrahamMackintosh.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2441-AbrahamMackintosh.ps) >>/Users/jc/w/tmp/Tune-2441-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1800/AbrahamMackintosh.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_24413.log 147375 Log file, useful mostly for debugging
Tune-2441-AbrahamMackintosh.abc 154 ABC music file with the extracted tune(s)
Tune-2441-AbrahamMackintosh.ps 6 PostScript
Tune-2441-AbrahamMackintosh.txt 154 Plain-text file with the extracted tune(s)
Tune-2441-get.log 4213 Log file, useful mostly for debugging
Tune-24415-Remick.abc 149 ABC music file with the extracted tune(s)
Tune-24415-Remick.txt 149 Plain-text file with the extracted tune(s)
Tune-24415-get.log 3148 Log file, useful mostly for debugging
These files should be available for 24 hours.