XMLHttpRequest is not defined

The error message "XMLHttpRequest is not defined" usually occurs in a JavaScript environment where the XMLHttpRequest object is not available. This object is typically used to make HTTP requests and receive responses in web applications.

One possible reason for this error is that the code is running in an environment that does not support XMLHttpRequest, such as in a Node.js environment. In this case, you may need to use a different library or approach to make HTTP requests.

Another possibility is that the code is running in a browser, but the XMLHttpRequest object is not properly initialized. You can check if XMLHttpRequest is available by testing for its existence:

if (window.XMLHttpRequest) {
  // XMLHttpRequest is available
} else {
  // XMLHttpRequest is not available
}

If XMLHttpRequest is not available, you can try using a different approach to make HTTP requests, such as the Fetch API or a third-party library like Axios or jQuery.