vue is not defined

The error "vue is not defined" typically occurs when you are trying to use Vue.js without properly including it in your project. To resolve this issue, make sure you have included the Vue.js library in your HTML file by adding the following script tag:

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

Alternatively, you can use a local copy of the Vue.js library by downloading it from the official website (https://vuejs.org) and including it in your project folder.

Once you have included the Vue.js library, ensure that you are referencing it correctly in your JavaScript code. You can do this by checking if the variable "Vue" is defined before using it. For example:

if (typeof Vue !== 'undefined') {
  // Your Vue.js code here
} else {
  console.error("Vue.js is not defined");
}

By following these steps, you should be able to resolve the "vue is not defined" error and use Vue.js in your project successfully.