Flutter iOS build failure error with Multiple commands after the Xcode upgrade

This solution worked for me.

  1. Open ios/Runner.xcworkspace Select the Runner project in the project
    navigator sidebar.
  2. In the main view, select the Runner target, then select the Build Phases tab.
  3. Expand the Embed Frameworks phase and select Flutter.framework from the
    embedded frameworks list.
  4. Click – to remove Flutter.framework from the list (be sure to keep
    App.framework).

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