inter - project communication problem

[BaDi]

Situation description:

I want to call a "sub" in classA in ProjectA from ClassB in ProjectB

- ClassA is part of ProjectA which is compiled as a ActiveX(.exe) application.

- ClassA is puplic not creatable
- In ProjectB I made a reference to the ProjectA.exe
- In ClassB I declared ClassA like this:

Dim WithEvents objClassA as ClassA

- When ClassB is initialised I do this:

Set objClassA = ClA

- ClA is declared in ProjectB.ClassC :

Option Explicit

Public Property Get ClA() As ClassA
Set ClA = objClA
End Property

Private Sub Class_Initialize()
Set objClA = New CHOSTLINK
End Sub

Private Sub Class_Terminate()
Set objClA = Nothing
End Sub

- This ClassC is being initialised as soon as ProjectB is activated.

- ClassC is GlobalMultiUse

the error is:
Compile Error:
Object required

(referering to: Set objClassA = ClA)

Do I forget something?

Thanx in advance!