Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/DftY/Button_Whitaker.abc/1818"

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 ]
filesizedescription
Coll_42122.log 652441 Log file, useful mostly for debugging
Form_42121.log 819 Log file, useful mostly for debugging
Tune-4212-1818.abc 157 ABC music file with the extracted tune(s)
Tune-4212-1818.txt 157 Plain-text file with the extracted tune(s)
Tune-4212-get.log 3091 Log file, useful mostly for debugging
These files should be available for 24 hours.