Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/cache/Kerr_MM3-V2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2800-Kerr_MM3-V2.ps) >>/Users/jc/w/tmp/Tune-2800-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/cache/Kerr_MM3-V2.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-2800-Kerr_MM3-V2.abc 149 ABC music file with the extracted tune(s)
Tune-2800-Kerr_MM3-V2.ps 6 PostScript
Tune-2800-Kerr_MM3-V2.txt 149 Plain-text file with the extracted tune(s)
Tune-2800-get.log 34522 Log file, useful mostly for debugging
Tune-28000-get.log 16350 Log file, useful mostly for debugging
Tune-28001-get.log 7656 Log file, useful mostly for debugging
Tune-28002-Gow-CSR1-abc1.abc 150 ABC music file with the extracted tune(s)
Tune-28002-Gow-CSR1-abc1.ps 6 PostScript
Tune-28002-Gow-CSR1-abc1.txt 150 Plain-text file with the extracted tune(s)
Tune-28002-get.log 9524 Log file, useful mostly for debugging
Tune-28003-get.log 5427 Log file, useful mostly for debugging
Tune-28009-get.log 4321 Log file, useful mostly for debugging
These files should be available for 24 hours.