class initialize vb6

bonjour!

pourquoi je recois toujours le msgbox erreur dans la class_initialize tandisque dans la sub log msgbox welcome ?

Code:

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Dim a As Variant
Dim b As Variant
 
Public Sub log(a As Variant, b As Variant)
a = a
b = b
If a = "echo" And b = "echo" Then
    MsgBox "welcome "
    Else
    MsgBox "error"
End If
End Sub
 
Private Sub Class_Initialize()
log a, b
End Sub

Code:

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Private Sub Command1_Click()
Dim x As Class1
Set x = New Class1
x.log "echo", "echo"
End Sub