MusicExampleWithErrors.html looks for the Music.txt
file in source/eg/music, which is not a valid path
anywhere in the source tree.
It should either be changed to match MusicExample.html
(src/eg/music), or better, changed to point to the
examples sub-directory (examples/eg/music).
See my other bug report, #1201145.
Patch to clean up path to Music.txt