Usage of PlaySoundFile()

Hi,
I am writing a program for the brick for a school project. The documentation is really well and everything works, except the PlaySoundFile function. I cant get it to work. I tried 16Bit signed and unsigned WAV files. The only thing the brick does is make a clicking noise for about a second and after that it doesnt do anything. Could someone tell me what im doing wrong?
Thanks in advance,
Erwin