Falls at 2nd hurdle - (1) installed (2) doesn't get recognised

[rmcsharry]

Seems like a great add-on, but in Ember 2.7 it cannot be found...?

component/trail-card.js

import Ember from 'ember';
import InViewportMixin from 'ember-in-viewport';

export default Ember.Component.extend(InViewportMixin, {
  didEnterViewport() {
    console.log('entered');
  },
});

Error in console:

228 Uncaught Error: Could not find module ember-in-viewport imported from trekclient/components/trail-card

[ghost]

Just to be sure: Have you restarted the development server?

[rmcsharry]

Thanks...note to self: never stay up all night coding.