Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/12Minuets12Dances/CDfNH1783.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5136-CDfNH1783.ps) >>/Users/jc/w/tmp/Tune-5136-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/12Minuets12Dances/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
Coll_51361.log 270281 Log file, useful mostly for debugging
Coll_51366.log 315241 Log file, useful mostly for debugging
Tune-5136-CDfNH1783.abc 159 ABC music file with the extracted tune(s)
Tune-5136-CDfNH1783.ps 6 PostScript
Tune-5136-CDfNH1783.txt 159 Plain-text file with the extracted tune(s)
Tune-5136-get.log 8392 Log file, useful mostly for debugging
Tune-51363-get.log 15377 Log file, useful mostly for debugging
Tune-51364-get.log 6132 Log file, useful mostly for debugging
Tune-51365-get.log 14881 Log file, useful mostly for debugging
Tune-51369-get.log 10570 Log file, useful mostly for debugging
These files should be available for 24 hours.