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If 'PINTypeCode' in the Return Header has the value "Self-Select On-Line", and 'Spouse Date Of Birth' has a value, then 'Spouse Prior Year AGI or 'Spouse Prior Year PIN' or 'Spouse Electronic Filing PIN' must have a value.
This error means that you have left out a required piece of data on the 8879 page for the SPOUSE on the return,
To Correct:
Instructions for Direct Input Software:
Instructions for Interview Software: