pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4708-Navvie_G.ps) >>/Users/jc/w/tmp/Tune-4708-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/hornpipe/Navvie_G.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_47087.log 142804 Log file, useful mostly for debugging
Coll_47088.log 465575 Log file, useful mostly for debugging
Tune-4708-Navvie_G.abc 485 ABC music file with the extracted tune(s)
Tune-4708-Navvie_G.ps 35058 PostScript
Tune-4708-Navvie_G.txt 485 Plain-text file with the extracted tune(s)
Tune-4708-get.log 4343 Log file, useful mostly for debugging
These files should be available for 24 hours.