missed adding categories in store.js in video prior to 05:14

[aspiringguru]

minor error which students should be able to diagnose by this stage of the course, caused me some delay and annoying, hence the request to fix.

@ 05:00 in the vuex-state-getters lesson.
https://www.vuemastery.com/courses/mastering-vuex/vuex-state-getters

adding this code to EventCreate.vue

{{ cat }}

and
computed: mapState({
user: 'user',
categories: 'categories'
})

during the video, omitted adding categories in store.js
state: {
user: { id: 'abc123', name: 'adam Jahr' },
categories: [
'sustainability',
'nature',
'animal welfare',
'housing',
'education',
'food',
'community'
]
},

without categories in store.js the following error appears.

There was an error:
[actually more messages appear if you expand the feedback in developers console, but the error is not easy to recognize or diagnose, a broader problem I haven't worked on in this stack]

---

other unrelated issues/questions while I'm here. :)
Refreshing the app is not as simple as refreshing the page.
Not sure if hot reloading is the solution > https://vue-loader.vuejs.org/guide/hot-reload.html
Would really like to see a video explaining how to debug apps properly.