Thanks @BillyBag2, that worked for me.

Had the same problem. Xcode 12 Beta 6 solved it magically.

Thanks for your reply, but no matter where I put the file, it gets transferred to the Watch each time, even though it hasn't changed...

Thanks, this was very useful.

I was the one who posted about this error message disappearing in 12.0 beta 6. Unfortunately shortly after, the error came back. I'm now on the 12.2 beta and the error is still there. Any chance for some engineering feedback here? This seems to be a wide-spread issue...