Problem: The IRS - not eFile.com rejected your Federal Tax Return because your SSN is listed on an accepted Married Filing Jointly tax return (or a Head of Household return with the spouse exemption claimed) as the spouse.
Solution: Sign into your eFile.com account: https://mytaxes.efile.com/1040/signin, and click on Name & Address on the green section on the left. Then on the right side verify all SSN numbers. If they are correct, and you or your spouse were not listed on another return please visit this page about Identity Theft
Contact us with questions: https://www.efile.com/tax-service/contact/efile-contact/