XML error is a very common error it appears when you are working with a point of sale. You might see an error something like this because it is being used by others or there is an error in your XML file. You can troubleshoot by it yourself to resolve XML Errors in Quickbooks.
If you are still facing the same problem regarding the same. Then you can connect with the Quickbooks support team at +1-888-461-1540 for immediate assistance