Webpack Build Error With Tools Gotten from theme forest

Good Afternoon please I am getting an error from webpack when trying to build demo4 using webpack i got my files from ThemeForest.

Invalid configuration object. Webpack has been initialized using a configuration object that does not match the API schema.
- configuration[0].entry['js/widgets.bundle'] should be a non-empty array.
-> All modules are loaded upon startup. The last one is exported.