Camtasia recorder fails to start with audio device

Hi experts,
When I want to start a new record of my desktop this error appears and I have to choose a new audio device. I made some changes in the settings and is not working at all. Any solution ? How can I solve this and is there a problem with my audio device ?
Thank you !

Camtasia Recorder
A problem with your audio device will not allow the recording to start.
Try one of these: A different audio device by selecting another device within Recorder; Disible audio and just record the screen; Tweak the audio device settings – right –click the Volume button in your system tray and choose Recording Devices.
