Mismatch: X:20 doesn't match requested X:21
X:21 not found in http://john-chambers.us/~jc/music/book/CaledonianMusicalRepository/1806.abc
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9697-1806.ps) >>/Users/jc/w/tmp/Tune-9697-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/CaledonianMusicalRepository/1806.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
Coll_96975.log 336213 Log file, useful mostly for debugging
Find_96979.log 1431 Log file, useful mostly for debugging
Form_96978.log 731 Log file, useful mostly for debugging
Tune-9697-1806.abc 0 ABC music file with the extracted tune(s)
Tune-9697-1806.ps 6 PostScript
Tune-9697-1806.txt 0 Plain-text file with the extracted tune(s)
Tune-9697-get.log 28882 Log file, useful mostly for debugging
Tune-96974-get.log 1661 Log file, useful mostly for debugging
Tune-96976-get.log 5209 Log file, useful mostly for debugging
These files should be available for 24 hours.