pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-90429-23_l_Ecolier.ps) >>/Users/jc/w/tmp/Tune-90429-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/DftY/1770/Longman_Cotillons/23_l_Ecolier.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_90429.log 281413 Log file, useful mostly for debugging
Tune-90429-23_l_Ecolier.abc 1461 ABC music file with the extracted tune(s)
Tune-90429-23_l_Ecolier.ps 41434 PostScript
Tune-90429-23_l_Ecolier.txt 1461 Plain-text file with the extracted tune(s)
Tune-90429-get.log 4706 Log file, useful mostly for debugging
These files should be available for 24 hours.