Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/DashingWhiteSergeant.abc/500"

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.55 512x512 ]
filesizedescription
Coll_3986.log 341369 Log file, useful mostly for debugging
Coll_39860.log 279027 Log file, useful mostly for debugging
Coll_39862.log 338588 Log file, useful mostly for debugging
Coll_39863.log 470157 Log file, useful mostly for debugging
Coll_39867.log 493704 Log file, useful mostly for debugging
Coll_39869.log 1585061 Log file, useful mostly for debugging
Tune-3986-500.abc 156 ABC music file with the extracted tune(s)
Tune-3986-500.txt 156 Plain-text file with the extracted tune(s)
Tune-3986-get.log 12059 Log file, useful mostly for debugging
Tune-39862-get.log 5511 Log file, useful mostly for debugging
Tune-39863-get.log 17215 Log file, useful mostly for debugging
Tune-39865-get.log 9985 Log file, useful mostly for debugging
Tune-39866-get.log 9438 Log file, useful mostly for debugging
Tune-39867-get.log 10008 Log file, useful mostly for debugging
Tune-39868-get.log 13007 Log file, useful mostly for debugging
Tune-39869-get.log 3425 Log file, useful mostly for debugging
These files should be available for 24 hours.