Mismatch: X:1138 doesn't match requested X:40
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5493-Polka.ps) >>/Users/jc/w/tmp/Tune-5493-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
Coll_54935.log 140992 Log file, useful mostly for debugging
Tune-5493-Polka.abc 395 ABC music file with the extracted tune(s)
Tune-5493-Polka.ps 35931 PostScript
Tune-5493-Polka.txt 395 Plain-text file with the extracted tune(s)
Tune-5493-get.log 710959 Log file, useful mostly for debugging
These files should be available for 24 hours.