Error AddressOf operand must be the name of a method (without parentheses) in VB.NET

Dear Sir,

I have an error `AddressOf' operand must be the name of a method (without parentheses) `

Please Gude me

Thanks

Private Sub ShowBorder(ByVal show As Boolean)
    Dim action As New Action(Sub()
                                    For Each sideShadow In [shadows]
                                        sideShadow.Show(show)
                                    Next sideShadow

                                    If show Then
                                        isWindowMinimized = False
                                    End If
                                End Sub)

    If show = True AndAlso isWindowMinimized Then
        If isAnimationDelayed Then
            Return
        End If

        isAnimationDelayed = True
        Task.Factory.StartNew(Sub()
                                    System.Threading.Thread.Sleep(300)
                                    If isAnimationDelayed Then
                                        '`Below line code error 
                                        parentWindow.Invoke(New MethodInvoker(AddressOf action))
                                    End If

                                    isAnimationDelayed = False

                                End Sub)

    Else
        action()

        isAnimationDelayed = False
    End If

End Sub