Could not get product attributes

[shanAliKhos]

No description provided.

[danykrass]

No description provided.

It's simple as hell, it's the author's mistake. Webpack build the js file in the global JS directory, not in the backend/js folder.
You need to change the path in the .blade templates attribute/edit.blade and product/edit.blade.
Replace the line:
src="{{ asset('backend/js/app.js') }}"
with this one:
src="{{ asset('js/app.js') }}"