caught ReferenceError: Vue is not defined

This error occurs when you are trying to use Vue but it has not been properly imported or included in your code.

To fix this error, make sure that you have properly installed Vue and added it to your project using either a script tag or a module system.

If you are using a module system like ES6, make sure to import Vue at the top of your file before using it.

Example:

import Vue from 'vue';

// Your Vue app code here

If you are using a script tag, make sure to include Vue before your app code.

Example:

<script src="https://cdn.jsdelivr.net/npm/vue"></script>

<!-- Your Vue app code here -->