Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/Book09/Gow-CSR4-abc2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-15968-Gow-CSR4-abc2.ps) >>/Users/jc/w/tmp/Tune-15968-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Book09/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-15968-Gow-CSR4-abc2.abc 152 ABC music file with the extracted tune(s)
Tune-15968-Gow-CSR4-abc2.ps 6 PostScript
Tune-15968-Gow-CSR4-abc2.txt 152 Plain-text file with the extracted tune(s)
Tune-15968-Widow_Brady_031_3-D-32-3-001.svg 15422 Scalable Vector Graphics format
Tune-15968-Widow_Brady_031_3-D-32-3.abc 574 ABC music file with the extracted tune(s)
Tune-15968-Widow_Brady_031_3-D-32-3.txt 574 Plain-text file with the extracted tune(s)
Tune-15968-get.log 8597 Log file, useful mostly for debugging
These files should be available for 24 hours.