Running into this as well. I downloaded the xib from developer site and it fixed it, but then I quit Xcode, reopened it and the error came back!
Replacing it with a fresh copy works each time, but definitely looking for a solution to this!
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I'm seeing this as well so was wondering if there was something else I had to do to add support for macOS. I only just started testing my app on the desktop, but I'm unable to control it with the media keys under Monterey 12.0.1.
Following this thread.
Here's a CPU capture of the different states.