pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-89335-cohwel.ps) >>/Users/jc/w/tmp/Tune-89335-get.log 2>&1" returned status 256
http://www.lotro-abc.com/abc/cohwel.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-89335-cohwel.abc 68 ABC music file with the extracted tune(s)
Tune-89335-cohwel.ps 31111 PostScript
Tune-89335-cohwel.txt 68 Plain-text file with the extracted tune(s)
Tune-89335-get.log 4275 Log file, useful mostly for debugging
These files should be available for 24 hours.