'Vue' is not defined

To resolve the error "'Vue' is not defined" in a Vue application, you can follow these steps:

1. Import Vue: Make sure that you have imported the Vue library at the beginning of your file. You can import Vue using the following code: javascript import Vue from 'vue';

2. Check Vue version: Ensure that you have the correct version of Vue installed in your project. You can check the version in your package.json file or by running the following command in your terminal: npm list vue

3. Vue instance creation: Verify that you have created a Vue instance in your application. The Vue instance is the root of your Vue application and is responsible for rendering your components. You can create a Vue instance using the following code: javascript new Vue({ // options });

4. Mounting the Vue instance: Ensure that you have mounted the Vue instance to an element in your HTML file. This is typically done using the el option when creating the Vue instance. For example: javascript new Vue({ el: '#app', // other options });

5. Check element existence: Make sure that the element you are trying to mount the Vue instance to exists in the HTML file. It should have a corresponding ID that matches the el option in your Vue instance.

6. Build and run: If you are using a build system like webpack, make sure to build your project before running it. This will ensure that all the necessary files are bundled correctly.

By following these steps, you should be able to resolve the "'Vue' is not defined" error in your Vue application. Let me know if you need further assistance!