This error occurs because the student's SINF effective start or end date does not align with the student's enrollment date.

Resolution: 

Confirm that your dates are accurate.  An SINF file must be submitted after the SENR file has been posted without any errors (or with very few errors).  Always post your extract files in the following order: 

     1. SENR

     2. SINF

     3. SELA

     4. SPRG

Check Address History Dates.  Confirm that they align with the dates of the student's enrollment.