I had copied a target and got this behaviour too. I was because the scheme still had the target from the copied target so it was really building two apps into one I guess. I could see this in the archive by using "Show package contents" in Finder. Within there is Products > Applications folder where there was two apps :(
Resolved by removing the target from the scheme under "Build".
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Something is off. I have the same issue. This worked only about a week ago. I have tried both final cut and imovie in too many different ways.Also, loading app previews from other apps seems to fail way more often than usual and i have to attempt dragging into the upload window multiple times.The last part of the error "For more information, see the Developer Help" seems new - yields only this result on google...