Same here. Looks like it's a problem with TurboTax itself. Got this message today when trying to refile:
Description of error:
An XML document that represents a binary attachment must have a valid reference to an attached file.
What needs to be done:
This return cannot be filed at this time due to a processing error that will be corrected on February 6, 2019. On or after February 6, 2019 open the rejected return, review it for errors, and resubmit the return for electronic filing.
