Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1804/Gow-CSR1-abc1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8369-Gow-CSR1-abc1.ps) >>/Users/jc/w/tmp/Tune-8369-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1804/Gow-CSR1-abc1.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_83691.log 248685 Log file, useful mostly for debugging
Form_83691.log 806 Log file, useful mostly for debugging
Tune-8369-Gow-CSR1-abc1.abc 150 ABC music file with the extracted tune(s)
Tune-8369-Gow-CSR1-abc1.ps 6 PostScript
Tune-8369-Gow-CSR1-abc1.txt 150 Plain-text file with the extracted tune(s)
Tune-8369-get.log 4127 Log file, useful mostly for debugging
Tune-83692-GunFleetThe_PLFD1721_534.abc 371 ABC music file with the extracted tune(s)
Tune-83692-GunFleetThe_PLFD1721_534.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-83692-GunFleetThe_PLFD1721_534.ps 33790 PostScript
Tune-83692-GunFleetThe_PLFD1721_534.txt 371 Plain-text file with the extracted tune(s)
Tune-83692-get.log 5615 Log file, useful mostly for debugging
Tune-83695-get.log 5220 Log file, useful mostly for debugging
Tune-83697-get.log 1418 Log file, useful mostly for debugging
These files should be available for 24 hours.