Poderia me ajudar? Quando eu rodo “npm run start” ou “npm run watch” acontece esse erro:

(django_react) patterson@thoth:~/Downloads/django_react$ npm run start

> django_react@1.0.0 start /home/patterson/Downloads/django_react
> webpack — config webpack.config.js

/usr/bin/env: “node”: Arquivo ou diretório não encontrado

npm ERR! Linux 4.15.0–45-generic
npm ERR! argv “/usr/bin/nodejs” “/usr/bin/npm” “run” “start”
npm ERR! node v4.2.6
npm ERR! npm v3.5.2
npm ERR! file sh
npm ERR! code ELIFECYCLE
npm ERR! errno ENOENT
npm ERR! syscall spawn
npm ERR! django_react@1.0.0 start: `webpack — config webpack.config.js`
npm ERR! spawn ENOENT
npm ERR!
npm ERR! Failed at the django_react@1.0.0 start script ‘webpack — config webpack.config.js’.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the django_react package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! webpack — config webpack.config.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs django_react
npm ERR! Or if that isn’t available, you can get their info via:
npm ERR! npm owner ls django_react
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR! /home/patterson/Downloads/django_react/npm-debug.log
(django_react) patterson@thoth:~/Downloads/django_react$

Já procurei no google e não consigo resolver, o que pode ser?