After trying a few things, I was able to fix it. The problem here is that the Info.plist file was included in the build phase of the instance resources. Since this file has already been copied by Xcode elsewhere, it causes a conflict. I removed Info.plist from the copy instance resource assembly phase and fixed the problem.
Due to the obscure message given by Xcode, we hope that this will at least help others faster in the future.
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