How to fix crystal reports: : "load report failed" ERROR using VB.NET

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VB

CrystalReports

Sometimes crystal report give me an error like "LOAD REPORT FAILED"

but not all time my code is below i load my crystl report at temp folder i am not giving crystal report path at line "rpt=new cryName" - cryName is my Crystal report Name when i write this type of code and run crystal report load on temp folder on same pc but some time it gives error like report load errro please help me


waiting for your valuable reply

What I have tried:

rpt = New cryName

        Dim dt As New DataTable("PhoneBook")
        Dim dr As DataRow

        dt.Columns.Add("Label1", System.Type.GetType("System.String"))
        dt.Columns.Add("Label2", System.Type.GetType("System.String"))
        dt.Columns.Add("Label3", System.Type.GetType("System.String"))
        dt.Columns.Add("Label4", System.Type.GetType("System.String"))


        Try
            For i As Integer = 0 To dgvData.Rows.Count - 1
                dr = dt.NewRow
                dr("Label1") = dgvData.Item(0, i).Value.ToString
                dr("Label2") = dgvData.Item(1, i).Value.ToString
                dr("Label3") = dgvData.Item(2, i).Value.ToString
                dr("Label4") = dgvData.Item(3, i).Value.ToString


                dt.Rows.Add(dr)
            Next
            rpt.SetDataSource(dt)

         
            CrystalReportViewer1.ReportSource = rpt

          
        Catch ex As Exception
          
        End Try