X:191 not found in http://www.banjolin.co.uk/tunes/abcs/rosetree.abc
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-76507-rosetree.ps) >>/Users/jc/w/tmp/Tune-76507-get.log 2>&1" returned status 256
http://www.banjolin.co.uk/tunes/abcs/rosetree.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-76507-get.log 4257 Log file, useful mostly for debugging
Tune-76507-rosetree.abc 0 ABC music file with the extracted tune(s)
Tune-76507-rosetree.ps 6 PostScript
Tune-76507-rosetree.txt 0 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.