layui is not defined

The error message "layui is not defined" typically occurs when the JavaScript library "layui" is not properly loaded or included in the web page.

To resolve this issue, make sure you have included the necessary script tags for layui in your HTML file. You can do this by adding the following code in the head section of your HTML file:

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/layui@2.6.8/dist/layui.css">
<script src="https://cdn.jsdelivr.net/npm/layui@2.6.8/dist/layui.js"></script>

Also, ensure that the paths to the CSS and JavaScript files are correct and accessible. Once you have confirmed that the script is included correctly, you should be able to use the layui functions and objects without encountering the "layui is not defined" error.