pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4758-076_My_Nannie_O.ps) >>/Users/jc/w/tmp/Tune-4758-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Chappell/076_My_Nannie_O.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_47580.log 534942 Log file, useful mostly for debugging
Coll_47584.log 519487 Log file, useful mostly for debugging
Coll_47585.log 525107 Log file, useful mostly for debugging
Tune-4758-076_My_Nannie_O.abc 729 ABC music file with the extracted tune(s)
Tune-4758-076_My_Nannie_O.ps 38517 PostScript
Tune-4758-076_My_Nannie_O.txt 729 Plain-text file with the extracted tune(s)
Tune-4758-get.log 13116 Log file, useful mostly for debugging
Tune-47582-get.log 4442 Log file, useful mostly for debugging
These files should be available for 24 hours.