pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-42586-PrincesssCourtThe_PLFD1702_496.ps) >>/Users/jc/w/tmp/Tune-42586-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Playford/PrincesssCourtThe_PLFD1702_496.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_42586.log 479410 Log file, useful mostly for debugging
Form_42586.log 1001 Log file, useful mostly for debugging
Tune-42586-PrincesssCourtThe_PLFD1702_496.abc 509 ABC music file with the extracted tune(s)
Tune-42586-PrincesssCourtThe_PLFD1702_496.ps 35222 PostScript
Tune-42586-PrincesssCourtThe_PLFD1702_496.txt 509 Plain-text file with the extracted tune(s)
Tune-42586-get.log 4943 Log file, useful mostly for debugging
These files should be available for 24 hours.