Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1796/Gow-CSR2-abc2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9142-Gow-CSR2-abc2.ps) >>/Users/jc/w/tmp/Tune-9142-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1796/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_91422.log 231987 Log file, useful mostly for debugging
Form_91422.log 807 Log file, useful mostly for debugging
Tune-9142-Feuillet_Essex_FtFIoD1.abc 159 ABC music file with the extracted tune(s)
Tune-9142-Feuillet_Essex_FtFIoD1.pdf 2217 Portable Data Format
Tune-9142-Feuillet_Essex_FtFIoD1.ps 6 PostScript
Tune-9142-Feuillet_Essex_FtFIoD1.txt 159 Plain-text file with the extracted tune(s)
Tune-9142-Gow-CSR2-abc2.abc 150 ABC music file with the extracted tune(s)
Tune-9142-Gow-CSR2-abc2.ps 6 PostScript
Tune-9142-Gow-CSR2-abc2.txt 150 Plain-text file with the extracted tune(s)
Tune-9142-get.log 9332 Log file, useful mostly for debugging
These files should be available for 24 hours.