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There could be a few reasons for this error message:

1. The React plugin may not be installed in the project. To solve this, you can install the plugin by running npm install eslint-plugin-react --save-dev in your terminal.

2. The path to the React plugin in the .eslintrc.json file may be incorrect. Make sure that the plugin is referenced with the correct path, relative to the project root.

3. There may be typos or syntax errors in the .eslintrc.json file. Double-check the file for any errors or inconsistencies.

4. If you recently installed the React plugin, try restarting your development server or IDE to ensure that it recognizes the newly installed plugin.