Object doesn't support property or method 'entries' - error in IE11

You can downgrade your react-scripts version. In your package.json , alter to "react-scripts": "3.2.0".

Take a look at https://github.com/facebook/create-react-app/issues/8405.

It seems to be an issue with react-scripts version 3.3.0 and higher. You could find many issue reports in GitHub, for example: github.com/facebook/create-react-app/issues/8197, github.com/facebook/create-react-app/issues/8195.

It can still work with [email protected]. You could try to revert back to 3.2.0 as a workaround. Please also remember to delete .cache folder in node_modules and delete IE browser cache then try again.