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
{{ }}

{{ 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?

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