Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/DftY/Skillern.abc/1781"

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.65 512x512 ]
filesizedescription
Tune-3749-1781.abc 150 ABC music file with the extracted tune(s)
Tune-3749-1781.txt 150 Plain-text file with the extracted tune(s)
Tune-3749-get.log 3045 Log file, useful mostly for debugging
Tune-37495-get.log 3961 Log file, useful mostly for debugging
These files should be available for 24 hours.