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  • As per my understanding our existing projects are made in old swift and xcode which are supported old version of swift and xcode. So earlier what we did, we went on "Bundle Settings->Swift legacy Build System"and did select earlier version. Commented Sep 24, 2018 at 6:48
  • I originally had it on "Swift Legacy Build System", but it had been switched after restarting my computer. Even if you think you have this set correctly, it could still be worth double-checking. Commented Sep 26, 2018 at 17:17
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    This solution do not fixing the issue, it just hiding it. Commented Nov 26, 2018 at 16:38
  • Also make sure you change the Per-User workspace settings to the same ;) Commented Feb 19, 2019 at 7:04
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    Legacy Build System is now officially depreciated, as of Xcode 12: "The legacy build system is deprecated, and will be removed in a future release. (62742902)" (developer.apple.com/documentation/xcode-release-notes/…) Commented Sep 23, 2020 at 13:44