node:events:491 throw er; // Unhandled 'error' event ^

This error occurs when an 'error' event is emitted by an EventEmitter instance, but there is no listener registered to handle it. As a result, the error is thrown and not handled, causing the program to terminate.

To resolve this error, you need to add an error listener to the EventEmitter instance that is emitting the error event. This can be done using the 'on' method, like this:

eventEmitter.on('error', (err) => {
  console.error('Error occurred:', err);
});

In this example, we are adding an error listener that simply logs the error to the console. You can replace this with your own error handling logic.

It's important to note that you should always add an error listener to your EventEmitter instances to avoid this error from occurring.