Fed & State e-File Rejected (xml data failed schema validation)

I've tried to eFile twice and both times it's been rejected. TurboTax tells me "The XML data has failed schema validation. This return was not e-filed due to a timing issue or a processing error that has been corrected. No changes are needed ... it just needs to be e-filed again. If the reject continues you may need to print and file this return by mail."

This is really annoying. Anyway to fix it?