Uncaught (in promise) undefined

This error message is often seen in JavaScript when a Promise is rejected and there is no error message or value provided in the rejection. It usually means that some part of the code is trying to access a value that does not exist or has not been properly initialized.

To debug this error, you should look for any Promise rejections in your code and investigate what values are being passed around. You can also try adding a catch block to your Promise chain to handle any errors that may be thrown.

Here's an example of how you could catch this error:

myPromiseFunction()
  .then(result => {
    // do something with the result
  })
  .catch(error => {
    console.error('Error:', error);
  });

By adding a catch block, you'll be able to see the error message that's causing the Promise rejection, which should help you identify the issue.