Need a help with loading data using class module (Derivative & Portfolio)

[demian]

"Compile Error: Argument not optional". What does this mean?
Could you please enlighten me?

I still get the message " Compile Error: Variable not defined" after I change it as below...

Sub TestGetPortfolioValue()


    Dim newPort As Portfolio
    Set newPort = New Portfolio
    Set newPort.Derivatives = PopulateArray()
    
Dim i As Integer, j As Integer
Dim Mat As Variant
Mat = newPort.GetData(Cash)


'---------------------------------------------------
'load output_Cash range with matrix from Getdata() Function
For i = 1 To 10
    For j = 1 To 3
        Range("Output_Cash").Cells(i, j) = Mat(i, j)
    Next j
Next i