lilypond-book and the path

[Stefan Thomas]

Dear lilypond-users,
I made a strange experience.
If I process the following quoted file with lilypond-book in the path " ~/partituren " everything is fine!
But if I do the same in " ~/partituren/schüler/humboldt" it doesn't work! What could be the reason?

\documentclass[a4paper,12pt]{article}
\usepackage[ngerman]{babel}
\usepackage[utf8]{inputenc} 
\usepackage[paper=a4paper,left=20mm,right=20mm,top=25mm,bottom=25mm]{geometry} 


\begin{document}
\begin{center}
\huge Ein Versuch!            
\end{center}
Hallo, ich bin der Text. \\
 \begin{lilypond}
 \relative {c d e f g a b c }
 \end{lilypond} \\

Und das war die Musik!

\end{document}