How do I get rid of this message: WaveoutGetSelectControl()Failed

I am trying to capture videos with either Camtasia or Cam Studio. The recording of the video works flawless, but there is no audio recorded.
Camtasia offers several options copied from my Audio Mixer, but whichever I select, nothing happens.
Cam Studio offers less options (do not record, record from microphone or record from speakers). When I choose: 'record from speakers' I get this message: WaveoutGetSelectControl()Failed

Could anyone tell what I should do?
Many thanks
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