Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/cache/AMHSI-abc2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5750-AMHSI-abc2.ps) >>/Users/jc/w/tmp/Tune-5750-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/cache/AMHSI-abc2.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Form_57505.log 984 Log file, useful mostly for debugging
Tune-5750-AMHSI-abc2.abc 148 ABC music file with the extracted tune(s)
Tune-5750-AMHSI-abc2.ps 6 PostScript
Tune-5750-AMHSI-abc2.txt 148 Plain-text file with the extracted tune(s)
Tune-5750-get.log 8927 Log file, useful mostly for debugging
Tune-57501-get.log 9138 Log file, useful mostly for debugging
Tune-57503-cresc.abc 144 ABC music file with the extracted tune(s)
Tune-57503-cresc.ps 6 PostScript
Tune-57503-cresc.txt 144 Plain-text file with the extracted tune(s)
Tune-57503-get.log 3896 Log file, useful mostly for debugging
Tune-57505-get.log 5484 Log file, useful mostly for debugging
These files should be available for 24 hours.