Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/101SCD/CDfNH1783.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6752-CDfNH1783.ps) >>/Users/jc/w/tmp/Tune-6752-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/101SCD/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_6752.log 356855 Log file, useful mostly for debugging
Coll_67521.log 144069 Log file, useful mostly for debugging
Form_67522.log 944 Log file, useful mostly for debugging
Form_67528.log 876 Log file, useful mostly for debugging
Tune-6752-CDfNH1783.abc 148 ABC music file with the extracted tune(s)
Tune-6752-CDfNH1783.ps 6 PostScript
Tune-6752-CDfNH1783.txt 148 Plain-text file with the extracted tune(s)
Tune-6752-get.log 4057 Log file, useful mostly for debugging
Tune-67522-get.log 4712 Log file, useful mostly for debugging
Tune-67527-get.log 92756 Log file, useful mostly for debugging
These files should be available for 24 hours.