Web Reference: Invalid configuration object. Webpack has been initialised using a configuration object that does not match the API schema is because the configuration file doesn't match the version of webpack being used. Dec 19, 2025 · One common issue developers encounter is the ValidationError related to the devtool configuration, especially when using an empty string ('') in production mode. This blog dives deep into why this error occurs, how to fix it, and best practices for managing source maps in Webpack 5. Apr 21, 2023 · The error you are encountering is due to an incorrect configuration in your package.json file. In the "scripts" section, you have specified the entry point ./mainPage/main.js in the "build" command, which causes the entry point to be specified twice when running the build command.
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