how to use S7ProSimLib.S7ProSim

Hi Everybody,

I feel puzzle, when I writed the simple code as follow in VB 6.0, it always inform "Compiler error :Expected Function or Variable".

I don 't why, please help me out of it.
Thank you very much! have a nice day.

code:
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Option Explicit
Private WithEvents S7ProSim1 As S7PROSIMLib.S7ProSim

Private Sub Form_Load()
Dim S7ProSim1 As S7PROSIMLib.S7ProSim
Set S7ProSim1 = New S7PROSIMLib.S7ProSim
MsgBox S7ProSim1.Connect()

End Sub

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PS: I have already added "S7ProSim COM Object" as a reference.