Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/NewColl44Cot/JohnWalsh.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5577-JohnWalsh.ps) >>/Users/jc/w/tmp/Tune-5577-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/NewColl44Cot/JohnWalsh.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-5577-JohnWalsh.abc 154 ABC music file with the extracted tune(s)
Tune-5577-JohnWalsh.ps 6 PostScript
Tune-5577-JohnWalsh.txt 154 Plain-text file with the extracted tune(s)
Tune-5577-get.log 4089 Log file, useful mostly for debugging
Tune-55771-book_of_rights.abc 151 ABC music file with the extracted tune(s)
Tune-55771-book_of_rights.ps 6 PostScript
Tune-55771-book_of_rights.txt 151 Plain-text file with the extracted tune(s)
Tune-55771-get.log 12880 Log file, useful mostly for debugging
Tune-55772-get.log 5205 Log file, useful mostly for debugging
Tune-55773-get.log 4903 Log file, useful mostly for debugging
Tune-55775-get.log 8335 Log file, useful mostly for debugging
Tune-55776-get.log 5316 Log file, useful mostly for debugging
Tune-55779-get.log 3914 Log file, useful mostly for debugging
These files should be available for 24 hours.