pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-62751-AGW06.ps) >>/Users/jc/w/tmp/Tune-62751-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Scotland/program/20180706/AGW06.abc

Error exit status 256; here are some files to check:

[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Tune-62751-AGW06.abc 444 ABC music file with the extracted tune(s)
Tune-62751-AGW06.ps 34361 PostScript
Tune-62751-AGW06.txt 444 Plain-text file with the extracted tune(s)
Tune-62751-get.log 4420 Log file, useful mostly for debugging
These files should be available for 24 hours.