ExportToStream

[neivan]

ExportToStream no es meinbreo de WebApplication1.RcpRecibos
RcpRecibos es un informe de crystal reports.....
Me da este error en compilación a la hora de intentar exportar el informe a pdf.

Mi code es este:

Imports System.IO
Imports CrystalDecisions.CrystalReports.Engine
Public Class recibosimprimir
Inherits System.Web.UI.Page
Protected WithEvents Button1 As System.Web.UI.WebControls.Button
Protected WithEvents CrystalReportViewer1 As CrystalDecisions.Web.CrystalReportViewer
Dim CrRep As New RcpRecibos()
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
CrystalReportViewer1.ReportSource = CrRep
CrystalReportViewer1.DataBind()
End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim rptStream As New System.IO.MemoryStream()
rptStream = CType(CrRep.ExporttoStream(Integer.Parse(5)), System.IO.MemoryStream)
Response.Clear()
Response.Buffer = True
Response.ContentType = "application/pdf"
Response.AddHeader("Content-Disposition", "attachment;filename=Recibos.pdf")
Response.BinaryWrite(rptStream.ToArray())
Response.End()
End Sub
End Class

Llebo ya tiempo con este error,por que no me reconoce esta clase???me tengo qeu bajar alguna libreria ???? Agradeceré cualquier tipo de ayuda o aclaración.