Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/DftY/Johnson.abc/1766"

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.65 512x512 ]
filesizedescription
Sess-39560.log 116 Log file, useful mostly for debugging
Tune-39560-1766.abc 149 ABC music file with the extracted tune(s)
Tune-39560-1766.txt 149 Plain-text file with the extracted tune(s)
Tune-39560-get.log 3053 Log file, useful mostly for debugging
These files should be available for 24 hours.