Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/CDM5/Gow-CR-abc2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6546-Gow-CR-abc2.ps) >>/Users/jc/w/tmp/Tune-6546-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/CDM5/Gow-CR-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
Form_6546.log 913 Log file, useful mostly for debugging
Tune-6546-Gow-CR-abc2.abc 148 ABC music file with the extracted tune(s)
Tune-6546-Gow-CR-abc2.ps 6 PostScript
Tune-6546-Gow-CR-abc2.txt 148 Plain-text file with the extracted tune(s)
Tune-6546-get.log 4085 Log file, useful mostly for debugging
Tune-65460-get.log 5404 Log file, useful mostly for debugging
Tune-65461-get.log 12152 Log file, useful mostly for debugging
Tune-65462-get.log 4570 Log file, useful mostly for debugging
Tune-65463-06_le_Biberon.abc 1340 ABC music file with the extracted tune(s)
Tune-65463-06_le_Biberon.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-65463-06_le_Biberon.ps 38376 PostScript
Tune-65463-06_le_Biberon.txt 1340 Plain-text file with the extracted tune(s)
Tune-65463-get.log 10421 Log file, useful mostly for debugging
Tune-65465-get.log 4365 Log file, useful mostly for debugging
Tune-65467-get.log 4694 Log file, useful mostly for debugging
Tune-65469-get.log 3580 Log file, useful mostly for debugging
These files should be available for 24 hours.