pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4257-Aird_vol1_abc2.ps) >>/Users/jc/w/tmp/Tune-4257-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Aird/Aird_vol1_abc2.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.65 512x512 PNG]
filesizedescription
Coll_42578.log 1085883 Log file, useful mostly for debugging
Form_42572.log 859 Log file, useful mostly for debugging
Tune-4257-Aird_vol1_abc2.abc 66527 ABC music file with the extracted tune(s)
Tune-4257-Aird_vol1_abc2.ps 859741 PostScript
Tune-4257-Aird_vol1_abc2.txt 66527 Plain-text file with the extracted tune(s)
Tune-4257-get.log 272126 Log file, useful mostly for debugging
These files should be available for 24 hours.