What's going wrong with mudela ??

[Marcel Gerrits]

Hi,
I've a small question:
I wrote the attached mudela file. When I run ly2dvi, a lot of errors
are reported (lilypond does not accept 'a and 'b (I guess it should).
Why doesn't this work ?

Best regards, Marcel
\score {
  \melodic {
     \clef "violin";
     \meter 4/4;
     \octave c';

     'a 'b c d e f g a b c' d' e'

  }
}