Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/_/CDfNH1783.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-63088-CDfNH1783.ps) >>/Users/jc/w/tmp/Tune-63088-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/_/CDfNH1783.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-63088-CDfNH1783.abc 143 ABC music file with the extracted tune(s)
Tune-63088-CDfNH1783.ps 6 PostScript
Tune-63088-CDfNH1783.txt 143 Plain-text file with the extracted tune(s)
Tune-63088-GoodMorning.abc 23097 ABC music file with the extracted tune(s)
Tune-63088-GoodMorning.pdf 411319 Portable Data Format
Tune-63088-GoodMorning.ps 252763 PostScript
Tune-63088-GoodMorning.txt 23097 Plain-text file with the extracted tune(s)
Tune-63088-get.log 23971 Log file, useful mostly for debugging
These files should be available for 24 hours.