pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-42051-000_TitlePage.ps) >>/Users/jc/w/tmp/Tune-42051-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/AbrahamMackintosh/000_TitlePage.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Form_42051.log 821 Log file, useful mostly for debugging
Tune-42051-000_TitlePage.abc 1051 ABC music file with the extracted tune(s)
Tune-42051-000_TitlePage.ps 31885 PostScript
Tune-42051-000_TitlePage.txt 1051 Plain-text file with the extracted tune(s)
Tune-42051-get.log 4677 Log file, useful mostly for debugging
These files should be available for 24 hours.