How do you pass an array of strings to a webservice?

I have a Webservice that takes in an array of strings and return a concatination of these strings:

<WebMethod()> _
    Public Function HelloWorld(ByVal the() As String) As String
        Dim rtn As String = ""
        Dim i As Integer
        For i = 0 To the.Length
            rtn = the(i).ToString & " " & rtn
        Next
        Return rtn
    End Function

I want to use an excel XP worksheet to call this webservice:

Private Sub CommandButton1_Click()
    Dim ExampleVar As New clsws_Service1
    Dim rtn As String
    Dim stringPassed(1) As String
    stringPassed(0) = "Hello"
    stringPassed(1) = "World"

    rtn = ExampleVar.wsm_Test(stringPassed)
    MsgBox (rtn)
End Sub

Currently it is telling me that I have a compile error because the type is mismatched. Can anyone help?