Help me about v-calendar with dynamic attributes in firebase

Im using vuejs, firestore, v-calendar plugin to create a tracking web app.
Here my code:

Them ngay nghi
{{ day.day }}

{{ attr.customData.title }}

It always thro this exception:
Invalid prop: type check failed for prop “attributes”. Expected Object, Array, got Promise

How can I resolve it?
Many thanks for your help. Im very new at Vuejs.

It looks like you are passing a prop to v-calendar and it is expecting an objecting, but what is being passed is a promise. Could you provide your code?

This forum uses markdown. You need to use triple backticks around code blocks for them to be formatted correctly. We can’t see most of the code in your original post. Please check the preview of your posts before posting to check that they are rendering as expected.