Provide the class name in the pages & classes tab and try to save. If not even resolved then check the results page. i guess it is dependent.Relationship(1). Please check the clipboard for exact structure.
To solve this issue, you need to add a pagelist dependents to the Benefits Enrollment class.
I believe you have already created a Data Type with name Dependents. And make sure you have added a property Relationship property to it.
Now, go to Apps >> Select Benefits Enrollment >> Data Model >> Property >> Right Click And select Create...
Give the label as dependents (As per your requirements)
Now click Create and Open. It will create a property. Now Change the Property type from Text to Page List As you are refering to an array by specifying the index, I believe it is Page List. If it is a Single page, remove the index, and use the Property TYpe as Single Page
Once you select page list, it will ask you to enter the Page Defination. It is the class of your dependents. (As per my undertanding it should TGB-HRApps-Data-Dependent.....