Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1767/Gow-CSR2-abc2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4038-Gow-CSR2-abc2.ps) >>/Users/jc/w/tmp/Tune-4038-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1767/Gow-CSR2-abc2.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_40387.log 266612 Log file, useful mostly for debugging
Find_40383.log 1756 Log file, useful mostly for debugging
Tune-4038-Gow-CSR2-abc2.abc 150 ABC music file with the extracted tune(s)
Tune-4038-Gow-CSR2-abc2.ps 6 PostScript
Tune-4038-Gow-CSR2-abc2.txt 150 Plain-text file with the extracted tune(s)
Tune-4038-get.log 5412 Log file, useful mostly for debugging
Tune-40383-get.log 1439 Log file, useful mostly for debugging
Tune-40387-get.log 4366 Log file, useful mostly for debugging
Tune-40388-get.log 1425 Log file, useful mostly for debugging
These files should be available for 24 hours.