Error when i try to convert .m4a to pcm

Hi,

I am trying to convert a m4a file to PCM and i always get this error, what can be the possible reason??

Error while loading the QuickTime movie headers

[soiaf]

Hi,
Would it be possible to upload a sample m4a file somewhere so I can see the problem myself? If you'd prefer to email me a file, my email address is at the bottom of the README file.
Hopefully we'll get this sorted out quickly for you!