Error in display name for employee in 'SYS08 Employee Details' module
I am in the learning phase of L1MB now and facing error in 'SYS08 Employee Details' module where display name for employee #E2 employee is not converting into text format. I have added 'Display Name' in Lists and rollups -> General Lists -> #E2 employees -> Chose drop-down Display Name Property to "Display Name".
Please see attached image and guide me on how to resolve this error.
Employee details not reflecting