Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/GM/proto.abc/1753"

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 ]
filesizedescription
Coll_27996.log 266066 Log file, useful mostly for debugging
Form_27996.log 1675 Log file, useful mostly for debugging
Tune-27996-1753.abc 145 ABC music file with the extracted tune(s)
Tune-27996-1753.txt 145 Plain-text file with the extracted tune(s)
Tune-27996-69_WelchJig.abc 749 ABC music file with the extracted tune(s)
Tune-27996-69_WelchJig.txt 749 Plain-text file with the extracted tune(s)
Tune-27996-get.log 6281 Log file, useful mostly for debugging
These files should be available for 24 hours.