lilypond and emacs

[David Pirotte]

Hello,

as suggested in the doc, i added the following lines in my .emacs file:

        (load-library "lilypond-mode.el")
        (setq auto-mode-alist
              (cons '("\\.ly$" . LilyPond-mode) auto-mode-alist))
        (add-hook 'LilyPond-mode-hook (lambda () (turn-on-font-lock)))

however, it's constantly raising the following message when I enter
text in a .ly buffer:

        (63) (warning/warning) Error caught in `font-lock-pre-idle-hook'

is it a lilypond problem ("lilypond-mode.el") or an emacs problem?
how can I solve this problem?

thanks for some hint,
david