Generate plugin command doesn't work

[grctest]

Following the guide for creating a new plugin module: https://docs.rpgjs.dev/advanced/create-plugin.html

npx rpgjs generate module modified-default-gui
npm ERR! code E404
npm ERR! 404 Not Found - GET https://registry.npmjs.org/rpgjs - Not found
npm ERR! 404
npm ERR! 404  'rpgjs@latest' is not in this registry.
npm ERR! 404 You should bug the author to publish it (or use the name yourself!)
npm ERR! 404
npm ERR! 404 Note that you can also install from a
npm ERR! 404 tarball, folder, http url, or git url.

Is there an alternative terminal command I should use?

Thanks