Hy,

Let's say I have a dll made in VB6. This dll contains 3 class
modules(ClassA, ClassB, ClassOper) and one module(MyFunctions).
In MyFunctions I have a function like this:
Public Function DoSome(collecFirst as Collection, collecSecond as
Collection, objA as ClassA, objB as ClassB) as Double.

In ClassOper I have the function:
Public Function DoSomething(collecFirst as Collection, collecSecond as
Collection, objA as ClassA, objB as ClassB) as Double
If (IsValid) Then
DoSomething = DoSome(collecFirst, collecSecond, objA,
objB)
Else
DoSomething = -10000
End Function

I have an Excel woorkbook that use this dll. Let's say I have a macro
in Excel called TestDll
Public Sub TestDll()
Dim myOper as ClassOper
Set myOper = New ClassOper
MsgBox myOper.DoSomething(myCollecFirst, myCollecSecond, myObjA,
myObjB)
End Sub
When trying to run TestDll I get the following error: "argument not
optional Error 449"

Can somebody help me with this? (I hope that my example I good..)

Thanks and best regards,
O