Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/Compleat_Tutor/Gow-CR-abc1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4503-Gow-CR-abc1.ps) >>/Users/jc/w/tmp/Tune-4503-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Compleat_Tutor/Gow-CR-abc1.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_4503.log 294166 Log file, useful mostly for debugging
Coll_45032.log 261851 Log file, useful mostly for debugging
Coll_45034.log 256231 Log file, useful mostly for debugging
Coll_45035.log 270281 Log file, useful mostly for debugging
Coll_45038.log 1038038 Log file, useful mostly for debugging
Tune-4503-Gow-CR-abc1.abc 158 ABC music file with the extracted tune(s)
Tune-4503-Gow-CR-abc1.ps 6 PostScript
Tune-4503-Gow-CR-abc1.txt 158 Plain-text file with the extracted tune(s)
Tune-4503-get.log 9437 Log file, useful mostly for debugging
Tune-45032-get.log 5538 Log file, useful mostly for debugging
Tune-45037-get.log 8532 Log file, useful mostly for debugging
These files should be available for 24 hours.