pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-23179-ChristchurchBells.ps) >>/Users/jc/w/tmp/Tune-23179-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/england/ChristchurchBells.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_23179.log 823 Log file, useful mostly for debugging
Tune-23179-ChristchurchBells.abc 1410 ABC music file with the extracted tune(s)
Tune-23179-ChristchurchBells.ps 39476 PostScript
Tune-23179-ChristchurchBells.txt 1410 Plain-text file with the extracted tune(s)
Tune-23179-get.log 4533 Log file, useful mostly for debugging
These files should be available for 24 hours.