pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-77787-sessionite.ps) >>/Users/jc/w/tmp/Tune-77787-get.log 2>&1" returned status 256
http://sessionite.com/docs/sessionite.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
Form_77787.log 931 Log file, useful mostly for debugging
Tune-77787-get.log 89911 Log file, useful mostly for debugging
Tune-77787-sessionite.abc 450 ABC music file with the extracted tune(s)
Tune-77787-sessionite.ps 35198 PostScript
Tune-77787-sessionite.txt 450 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.