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This means that the dependencies listed in the pubspec.yaml file have been updated, but the changes have not yet been reflected in the .darttool/packageconfig.json file.

The solution to this is to run the "flutter pub get" command again in the terminal. This will update the dependencies listed in .darttool/packageconfig.json file to match those in the pubspec.yaml file, and ensure that the app is using the latest versions of the required packages.