This error will occur when the camera which is been added has an audio sampling frequency preset that is different from the current audio sampling frequency in the global settings on the CamSwitcher app.
Global settings: Audio sampling rate = 44.1 kHz
cam settings : Audio encoding = 32 kHz
By pressing Confirm, the audio encoding on the cam will be changed to 44.1 kHz
The camera will now be added to the CamSwitcher app.