pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-54931-Polka.ps) >>/Users/jc/w/tmp/Tune-54931-get.log 2>&1" returned status 256
http://michel.bellon.free.fr/Musique/abc/Nouveau/Polka.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Form_54931.log 899 Log file, useful mostly for debugging
Tune-54931-Polka.abc 570 ABC music file with the extracted tune(s)
Tune-54931-Polka.ps 41972 PostScript
Tune-54931-Polka.txt 570 Plain-text file with the extracted tune(s)
Tune-54931-get.log 725301 Log file, useful mostly for debugging
These files should be available for 24 hours.