ARCHS[@]: unbound variable in Xcode 12

Note :- React native developers
After wasting couple of hours only solution that worked for me was

Open VSCode and go to directory ios/App/App.xcodeproj/project.pbxproj that file
and perform a search EXCLUDED_ARCHS

EXCLUDED_ARCHS = arm64; 

and delete everyline containing EXCLUDED_ARCHS

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