It appears you may have created the properties MedicalPlan, DentalPlan and VisionPlan as Page List rather than Page. Using a Page List property, you will need to indicate the subscript value, e.g. .MedicalPlan(1).EmployeeCost.
However, since a BenefitsEnrollment case only have a single Medical Plan, using a Page mode property is more appropriate.
To rectify, you will need to delete away the 3 properties, and recreate them again. Be careful to select the correct property mode when recreating them.