pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-26156-___.ps) >>/Users/jc/w/tmp/Tune-26156-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/session/jig/Confess-Em,Gm-24-2.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-26156-___.abc 1081 ABC music file with the extracted tune(s)
Tune-26156-___.ps 35532 PostScript
Tune-26156-___.txt 1081 Plain-text file with the extracted tune(s)
Tune-26156-get.log 4492 Log file, useful mostly for debugging
These files should be available for 24 hours.