If you receive this error, check that your grade plan formula is pulling the correct grades to calculate. This is done through the Academics capability:
  1. Go to Academics > Grades > Grading Setup > School Year Setup
  2. Filter and search for the grade plan group and school year on the left
  3. Click the View button
  4. Click view on the left for the Term's grade plan affected
  5. Click the edit button
  6. Click the Formula button for the grade plan grade
  7. Click edit for the formula being used