FAQ: Introduction to Vue - Review

This community-built FAQ covers the “Review” exercise from the lesson “Introduction to Vue”.

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This exercise can be found in the following Codecademy content:

Learn Vue.js

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How come this section doesn’t cover proper custom component registration? Because I’ve tried building my own app with a custom component (much like the tweet component) and I’m running into this error:
"Unknown custom element: did you register the component correctly? "

I was unprepared for this and I am having a hard time fixing it. I really feel like this should be covered more because the “tweet” element in the markup is just there, and this error I am encountering in my own app is not even discussed.