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There are a few things you can try to resolve this issue:
Clean build: Go to Product -> Clean Build Folder in Xcode and then try running the app again.
Re-install Flutter: Try re-installing Flutter using the Flutter installation instructions for your operating system.
Re-install Xcode: If none of the above steps work, try re-installing Xcode to make sure all necessary files have been installed.
Update Flutter: Make sure that you are using the latest version of Flutter by running "flutter upgrade" in the terminal.
Add the missing file manually: If the above steps fail, you can try adding the missing file manually by downloading it from the internet and placing it in the appropriate directory.