Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/Book18/Gow-CSR4-abc2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3922-Gow-CSR4-abc2.ps) >>/Users/jc/w/tmp/Tune-3922-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Book18/Gow-CSR4-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
Tune-3922-Gow-CSR4-abc2.abc 152 ABC music file with the extracted tune(s)
Tune-3922-Gow-CSR4-abc2.ps 6 PostScript
Tune-3922-Gow-CSR4-abc2.txt 152 Plain-text file with the extracted tune(s)
Tune-3922-get.log 9794 Log file, useful mostly for debugging
Tune-39221-get.log 3168 Log file, useful mostly for debugging
Tune-39224-get.log 3873 Log file, useful mostly for debugging
Tune-39226-get.log 3700 Log file, useful mostly for debugging
Tune-39229-get.log 4354 Log file, useful mostly for debugging
These files should be available for 24 hours.