1. Click Configuration, Fields
  2. In the left frame, select Individual Relationships
  3. In the right frame, unmark the Required checkbox for the Recip Relation Code field
OR

Add the Reciprocal Relationship Code to the relationship record, or the SRRecip header and value to the import spreadsheet. Also, confirm that records without spouses have all of the spouse data entry fields left blank in the data file. 

OR 

Ensure the spouse fields are only set to be imported once and have the correct extensions.