What does the error message "Missing required modules: 'Realm.Private', 'Realm'" mean in the context of Realm Swift unit testing?

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The error message "Missing required modules: 'Realm.Private', 'Realm'" in the context of Realm Swift unit testing means that the necessary frameworks, 'Realm.Private' and 'Realm', are not properly imported or included in the project. These frameworks are required for Realm to function properly, and their absence may cause issues in unit testing. This error message may appear when attempting to run tests on a project that is missing the required Realm frameworks, or when attempting to access Realm objects without properly importing the necessary modules.