Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/DftY/Goulding_AK.abc/1808"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6788-1808.ps) >>/Users/jc/w/tmp/Tune-6788-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/DftY/Goulding_AK.abc/1808

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_67881.log 257636 Log file, useful mostly for debugging
Coll_67883.log 250611 Log file, useful mostly for debugging
Coll_67889.log 1487531 Log file, useful mostly for debugging
Tune-6788-1808.abc 153 ABC music file with the extracted tune(s)
Tune-6788-1808.ps 6 PostScript
Tune-6788-1808.txt 153 Plain-text file with the extracted tune(s)
Tune-6788-get.log 3960 Log file, useful mostly for debugging
Tune-67880-get.log 3753 Log file, useful mostly for debugging
Tune-67881-get.log 1381 Log file, useful mostly for debugging
Tune-67885-get.log 169088 Log file, useful mostly for debugging
Tune-67886-get.log 62304 Log file, useful mostly for debugging
Tune-67888-get.log 49084 Log file, useful mostly for debugging
These files should be available for 24 hours.