pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-50956-Crossing_the_Stream.ps) >>/Users/jc/w/tmp/Tune-50956-get.log 2>&1" returned status 256
http://tunearch.org/wiki/Crossing_the_Stream

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-50956-Crossing_the_Stream.abc 403 ABC music file with the extracted tune(s)
Tune-50956-Crossing_the_Stream.ps 33960 PostScript
Tune-50956-Crossing_the_Stream.txt 403 Plain-text file with the extracted tune(s)
Tune-50956-get.log 5131 Log file, useful mostly for debugging
These files should be available for 24 hours.