X:0 not found in http://roaringjelly.org/~jc/music/book/Kohlers/21000_.abc
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-31758-21000_.ps) >>/Users/jc/w/tmp/Tune-31758-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Kohlers/21000_.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Form_31758.log 1708 Log file, useful mostly for debugging
Tune-31758-21000_.abc 0 ABC music file with the extracted tune(s)
Tune-31758-21000_.ps 6 PostScript
Tune-31758-21000_.txt 0 Plain-text file with the extracted tune(s)
Tune-31758-get.log 3953 Log file, useful mostly for debugging
These files should be available for 24 hours.