X:0 not found in http://john-chambers.us/~jc/contra/_2.abc
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-47850-_2.ps) >>/Users/jc/w/tmp/Tune-47850-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/contra/_2.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_47850.log 287140 Log file, useful mostly for debugging
Tune-47850-_2.abc 0 ABC music file with the extracted tune(s)
Tune-47850-_2.ps 6 PostScript
Tune-47850-_2.txt 0 Plain-text file with the extracted tune(s)
Tune-47850-get.log 3797 Log file, useful mostly for debugging
These files should be available for 24 hours.