Return Type of function is not CLS Compliant .How can Fix this?

I have the following code and I get the above warning

In another project i have something similar but I dont get the warning and cannot see the difference

Any ideas how to remove it

Namespace TSInterfaces
    Public Interface IEmployee(Of T)

        Function GetEmployee(ByVal EmployeeID As Integer) As TSStructures.StructEmployee
        Function GetAllEmployees() As MyCollectionBindingList(Of T)

    End Interface
End Namespace

Namespace TSStructures
    <Serializable()> _
     Public Structure StructEmployee

        Public LastName As String
        Public FirstName As String

End Structure
End Namespace

'When i go to implement the interface I get "
'Return Type of function "Employee_Read" is not CLS Compliant"

Partial Class EmployeeDao
Implements TSInterfaces.IEmployee(Of EmployeeDao)

    Public Function GetEmployee(ByVal EmployeeID As Integer) As TSStructures.StructEmployee Implements TSInterfaces.IEmployee(Of EmployeeDao).GetEmployee

    End Function

end class

thanks a lot for any feedback

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