Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/12Minuets12Dances/Kohlers1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3750-Kohlers1.ps) >>/Users/jc/w/tmp/Tune-3750-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/12Minuets12Dances/Kohlers1.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_37503.log 266066 Log file, useful mostly for debugging
Coll_37508.log 338444 Log file, useful mostly for debugging
Coll_37509.log 390164 Log file, useful mostly for debugging
Form_37508.log 832 Log file, useful mostly for debugging
Tune-3750-Kohlers1.abc 158 ABC music file with the extracted tune(s)
Tune-3750-Kohlers1.ps 6 PostScript
Tune-3750-Kohlers1.txt 158 Plain-text file with the extracted tune(s)
Tune-3750-get.log 4100 Log file, useful mostly for debugging
Tune-37503-get.log 148781 Log file, useful mostly for debugging
Tune-37506-get.log 10951 Log file, useful mostly for debugging
Tune-37508-get.log 3399 Log file, useful mostly for debugging
These files should be available for 24 hours.