Efile rejected due to /Return/ReturnData/IRS1116/ResidenceForeignCountryCd - Data in the return is missing or invalid.

When I tried to file my return it was rejected with the following error: 

/Return/ReturnData/IRS1116/ResidenceForeignCountryCd

- Data in the return is missing or invalid. Please double check your entries.

There is NO error code provided.

Turbotax itself doesn't find any errors and I have reviewed the 1116 Forms and they appear OK. 

Does anyone know what this error means and how I can correct it?