Problem with docs compilation. MusicXML?

[Francisco Vila]

I obtain this message when trying to compile the docs:

  error: failed files: "b9/lily-50c2d14a.ly 39/lily-fb53c11d.ly
e3/lily-de1b891c.ly"

I have found these files in

./input/regression/musicxml/out-www/b9/lily-50c2d14a.ly
./input/regression/musicxml/out-test/39/lily-fb53c11d.ly
./input/regression/musicxml/out-www/39/lily-fb53c11d.ly
./input/regression/musicxml/out-test/e3/lily-de1b891c.ly
./input/regression/musicxml/out-www/e3/lily-de1b891c.ly

>From the prefix I suspect from something related to MusicXML that
produces the problem.

What can I do to track what source files are guilty?

How can I skip this part and compile eg NR or LM only?

Thanks!
-- 
Francisco Vila. Badajoz (Spain)
http://www.paconet.org