Teamspeak SDK, Client fails to open devices

Hi,

I'm trying to integrate Teamspeak SDK into my application. I'm using Unity3d with C#.

By copying the client example code into the project and starting a client an error gets thrown when the playback and capture devices should be opened:

 device not registered/known

This is the code for opening it (taken from the SDK C# example):

 ts3client_openPlaybackDevice(mServerConnectionHandlerID, "", null);
 ts3client_openCaptureDevice(mServerConnectionHandlerID, "", null);  

Any ideas why this happens? If I start the code within Microsoft Visual Studio no errors occur. So it seems to be somehow related to Unity.

Thanks!

Kathrin