Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/cache/Kohlers.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1757-Kohlers.ps) >>/Users/jc/w/tmp/Tune-1757-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/cache/Kohlers.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-1757-Kohlers.abc 145 ABC music file with the extracted tune(s)
Tune-1757-Kohlers.ps 6 PostScript
Tune-1757-Kohlers.txt 145 Plain-text file with the extracted tune(s)
Tune-1757-get.log 4007 Log file, useful mostly for debugging
Tune-17570-get.log 12777 Log file, useful mostly for debugging
Tune-17571-get.log 119981 Log file, useful mostly for debugging
Tune-17573-get.log 5064 Log file, useful mostly for debugging
Tune-17574-get.log 8715 Log file, useful mostly for debugging
Tune-17579-get.log 3292 Log file, useful mostly for debugging
These files should be available for 24 hours.