Cannot find module 'vuetify-loader/lib/plugin'

Question

When I load vuetify via the vue-cli3, I get an error when i do npm run serve, saying there is a missing loader.

Docs etc and searches have come up blank.

This is

Answer 1

I've got the same issues while creating new Vuetify app by official guide.

After adding vuetify: vue add vuetify
The missing step was installing new npm dependencies with: npm install

Later I run npm run serve and it started succesfully.
There is an issue in the documentation!