Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/Gow/CSR-abc1.abc/Gow4.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9207-Gow4.ps) >>/Users/jc/w/tmp/Tune-9207-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Gow/CSR-abc1.abc/Gow4.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-9207-Gow4.abc 153 ABC music file with the extracted tune(s)
Tune-9207-Gow4.ps 6 PostScript
Tune-9207-Gow4.txt 153 Plain-text file with the extracted tune(s)
Tune-9207-get.log 8755 Log file, useful mostly for debugging
Tune-92074-get.log 3874 Log file, useful mostly for debugging
Tune-92075-get.log 1394 Log file, useful mostly for debugging
Tune-92078-get.log 1550 Log file, useful mostly for debugging
Tune-92079-Playford_AB.abc 149 ABC music file with the extracted tune(s)
Tune-92079-Playford_AB.txt 149 Plain-text file with the extracted tune(s)
Tune-92079-get.log 3208 Log file, useful mostly for debugging
These files should be available for 24 hours.