Mismatch: X:6853 doesn't match requested X:6854
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3183-h.ps) >>/Users/jc/w/tmp/Tune-3183-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/terra.es/personal8/niltoni/h.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_31831.log 910 Log file, useful mostly for debugging
Tune-3183-get.log 171527 Log file, useful mostly for debugging
Tune-3183-h.abc 483 ABC music file with the extracted tune(s)
Tune-3183-h.ps 36403 PostScript
Tune-3183-h.txt 483 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.