This error occurs because a section was submitted with being properly populated.
When populating the Instructional Strategy (INS) field, the Education Service (ESR) field must also be populated. Check the Master Schedule sections (MST), or Teacher table (TCH) for elementary schools, and verify that appropriate information is populated. The following queries may be helpful:
LIST TCH TE ESR LI INS
LIST MST TCH MST.SE TCH.TE MST.ESR MST.LI MST.INS