error at output keyword

Thnx for reply abhinav,

I haven't declared "Output" anywhere in the program and i even tried to declare as "XDocument" as you said.That too didn't worked.

Look at the complete code once....

Imports AXMMCFGLib
Partial Class _Default
    Inherits System.Web.UI.Page
    Protected objMessageDB As XMessageDB
    Protected objMessage As XMessage
    Protected objConstants As XConstants
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        objMessageDB = New XMessageDB
        objConstants = New XConstants
        objMessageDB.Open()
        Dim output As New
        output.InnerHtml += "Open: ERROR #" & objMessageDB.LastError & _
                            " (" & objMessageDB.GetErrorDescription(objMessageDB.LastError) & ")"
        output.InnerHtml += "<BR><BR>"
        If (objMessageDB.LastError = 0) Then
            objMessage = objMessageDB.Create()
            output.InnerHtml += "Create: ERROR #" & objMessageDB.LastError & _
                                " (" & objMessageDB.GetErrorDescription(objMessageDB.LastError) & ")"
            output.InnerHtml += "<BR><BR>" & vbCrLf
            If (objMessageDB.LastError = 0) Then
                output.InnerHtml += "Message Created with ID: " & objMessage.ID
                output.InnerHtml += "<BR><BR>" & vbCrLf
                objMessage.Direction = objConstants.MESSAGEDIRECTION_OUT
                objMessage.Recipient = "+31647134225"
                objMessage.Status = objConstants.MESSAGESTATUS_PENDING
                objMessage.Type = objConstants.MESSAGETYPE_SMS
                objMessage.Body = "Message Created with ASP.NET(VB)"
                objMessageDB.Save(objMessage)
                output.InnerHtml += "Save: ERROR #" & objMessageDB.LastError & _
                                    " (" & objMessageDB.GetErrorDescription(objMessageDB.LastError) & ")"
                output.InnerHtml += "<BR><BR>" & vbCrLf
            End If
            objMessageDB.Close()
        End If
    End Sub
End Class

thx...
harsha