This error occurs because an error-free SENR file containing enrollment data for all students has not been posted.
Do not address ANY CERT errors until after the enrollment updates (SENR, SINF, SELA and SPRG) files have been posted with few to no errors. Most CERT errors are caused by file extracts that have not yet been posted error-free or from data that has not been correctly populated in Aeries.
Post a clean, complete SENR file. Confirm that all primary, secondary and short term enrollments are being reported to CALPADS. In Aeries CALPADS Extracts, check the Other Options and Schools tabs to verify all students are being extracted as expected. Confirm that the Code Translations for primary, secondary and short term enrollments have been correctly mapped.