6 years on and the silence is still deafening. I notice that NSMatrix is not depreciated as yet, it is only "discouraged in apps that run in macOS 10.8" (https://developer.apple.com/documentation/appkit/nsmatrix)

Using XCode 12.3, changing the Size parameter on Toolbar item from Explicit to Automatic fixes the error.

Code that cause the error message: err = AudioQueueSetProperty(_sndAqData->mQueue, kAudioQueueProperty_EnableLevelMetering, &meteringEnable, sizeof(meteringEnable));

I have the same (or very similar issue). I first noticed the issue first in macOS 10.14, prior versions did not show this message. I have isolated the function call which causes the error message: I checked _sndAgData->mQueue but everything in there is valid. My application has access to the Microphone and microphone recording is working fine. I would dearly love to find out what property has ID=1667788144 Xcode 11.5 Catalina 10.15.5