Excel vba: Property let procedure not defined and property get procedure did not return an object

Question

I have a Client class. Inside that class there is an array losses. First I create and populate with clients a clientsColl array. Then for

Answer 1

To conclude what was said in comments:

Your problem (error 451) often occures when you trying to compound properties. To represent this case we can use any structure of any object with properties.

Let's emulate it with array of collections:

Option Explicit

Sub Test()
    Dim Arr As Variant
    Dim Col As Collection
    Dim i As Long
    Dim j As Long

    ReDim Arr(1 To 10)

    For i = 1 To 10
        Set Col = New Collection
        For j = 1 To 10
            Call Col.Add(j)
        Next

        Set Arr(i) = Col
    Next

    On Error Resume Next
    Debug.Print Arr(1).Item(1)
    Debug.Print Arr(1).Item()(1)
    On Error GoTo 0
End Sub

Your problem stems from the fact that you're treating your properties as attributes. On not-so-compounded (or when your array is declared explicitly as array of class instances) level it works due to early binding. But when things start to get more complex - it's fail, since your property just another function.

Hence, to achieve what you want, you should call it explicitly with another pair of parentheses.