error in loading crystal report

Hi, I need to load my report.  i used crystal report 8.5 and it is embedded in vb.net.  i have some problems with the loading.  its says "failed to open document" and then when i hit enter it says again "invalid file format" . i used the microsoft application block.

here's my code:

Dim crReport As New ReportDocument
Dim AppPath As String = Request.PhysicalApplicationPath
Dim intPONumber As Integer = Request.QueryString("PONumber")
Dim dsReport As DataSet = New DataSet
Dim aSQL As SqlHelper
Dim spName As String = "sp_forreport"

strReportName = Request.QueryString("ReportName")
crReport.Load(AppPath + "Reports\CrystalReport1.rpt")
dsReport = aSQL.ExecuteDataset(CommonConstants.PurchaseOrderConnectionString, CommandType.StoredProcedure, spName, New SqlParameter("@purchaseOrderNumber", intPONumber))

crReport.Database.Tables(0).SetDataSource(dsReport)

CrystalReportViewer1.ReportSource = crReport 'gzi
Response.Redirect(AppPath + "Reports\CrystalReport1.rpt")

what have i done wrong?  please help me!!!