Paper element import not working in python

Question

Paper elements are not able to import in python-django environment, and an import error arises

Uncaught TypeError: Failed to resolve module specifier "@polymer/polymer/polymer-legacy.js". Relative references must start with either "/", "./", or "../".

I've tried to build the same project using polymer build still there is no improvement.

I've placed the polymer components inside a static folder in an app My project -> App-> static -> polymer files

Environment details:

OS: ubuntu 18.04
Lang: python 3.6- django 1.11
polymer version: 3

The error is from the js files present in the node_modules folder which is part of polymer project