We are currently evaluating this issue and will update this article when we have more information. In the meantime, follow these steps: 
  1. Log into FAWeb as the affected teacher.
  2. In Edit Assignments, view the Categories for the class for the specific marking column where the error occurs.
  3. Verify the Assignment's Categories exist by going to Edit Categories for the specific marking column for the class.
  4. In Edit Assignments, choose the appropriate category for any assignment's categories that has random numbers or doesn't exist in Edit Category.
  5. Save
  6. Try Viewing the grade book for the class again
  7. Repeat steps for other affected courses if applicable

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