Crystal Reports - passing Parameters to Report Fails With Access Database

I have a VB.Net 2005 windows forms application that can use either an Access database or SQL Server database. I recently added several new Crystal Reports 2008 .rpt files that the user can open from the main application. The code below works fine when linked to a SQL Server database but fails when linked to Access.

Public Function CRReportWindowParams(ByRef vstrRepName As String, _
                                   ByRef vstrRepTitle As String, _
                                   ByRef vstrRepFormula() As String, _
                                   ByRef vdictParams As Dictionary(Of Object, Object), _
                                   Optional ByRef vblRepSendToPrinter As Boolean = False, _
                                   Optional ByRef vstrPrinterName As String = "", _
                                   Optional ByVal vstrExtraText As String = "", _
                                   Optional ByVal viStartPage As Integer = 0, _
                                   Optional ByVal viEndPage As Integer = 0, _
                                   Optional ByVal viVisibleReport As Boolean = True, _
                                   Optional ByVal viRefNumType As Integer = 2, _
                                   Optional ByVal viRefNum As Integer = 0, _
                                   Optional ByVal viNumCopies As Integer = 1) As Boolean


        Dim lobjCRRptDoc As ReportDocument
        Dim lstrErrorMsg As String
        Dim liErrorCode As Integer
        Dim lobjRptForm As frmReportViewer
        'RefNumType =2 is a parameter query report
        Try
            Cursor.Current = Cursors.WaitCursor
            'set parameetrs for this report

            lobjCRRptDoc = GetReportDocument(vstrRepName, vstrRepTitle, vstrRepFormula)

            If vblRepSendToPrinter Then 'SEND DIRECTLY TO PRINTER
                lobjCRRptDoc.PrintOptions.PrinterName = vstrPrinterName
                lobjCRRptDoc.PrintToPrinter(viNumCopies, False, viStartPage, viEndPage)

            Else 'PRINT PREVIEW USER MANUALLY SELECT PRINTER
                If viRefNumType = 0 Then
                    lobjRptForm = New frmReportViewer
                Else
                    lobjRptForm = New frmReportViewer(viRefNumType, viRefNum)
                End If
                lobjRptForm.Text = vstrRepTitle
                mcolRptViewerForms.Add(lobjRptForm)
                'lobjRptForm.UseWaitCursor = True
                With lobjRptForm.crvRptViewer
                    '.UseWaitCursor = True
                    .ShowGotoPageButton = True
                    .ShowTextSearchButton = True
                    .ShowGroupTreeButton = True
                    .EnableDrillDown = True
                    .ShowPageNavigateButtons = True
                    .ShowZoomButton = True
                    .ShowLogo = False 'ms41
                    .ShowExportButton = True
                    .ShowPrintButton = True
                    .ShowRefreshButton = False 'must be false so parameter screen does not appear to unqualified users
                    .ShowCloseButton = True
                    .ShowPageNavigateButtons = True

                    'Set the viewer to the report object to be previewed.
                    '.ReportSource = lobjCRRptDoc
                    'Crystal reports parameters ++++++++++++++++++++++++++++++++++++++
                    Dim prI As KeyValuePair(Of Object, Object)
                    For Each prI In vdictParams
                        Try
                            Dim crParameterDiscreteValue As ParameterDiscreteValue
                            Dim crParameterFieldDefinitions As ParameterFieldDefinitions
                            Dim crParameterFieldLocation As ParameterFieldDefinition
                            Dim crParameterValues As ParameterValues

                            ' Get the report parameters collection.
                            crParameterFieldDefinitions = lobjCRRptDoc.DataDefinition.ParameterFields
                            ' Add a parameter value - START
'FAILS HERE ##################################                            
crParameterFieldLocation = crParameterFieldDefinitions.Item(prI.Key.ToString)
'########################################## SEE ERROR TEXT BELOW
                            crParameterValues = crParameterFieldLocation.CurrentValues
                            crParameterDiscreteValue = New CrystalDecisions.Shared.ParameterDiscreteValue
                            crParameterDiscreteValue.Value = prI.Value
                            crParameterValues.Add(crParameterDiscreteValue)
                            crParameterFieldLocation.ApplyCurrentValues(crParameterValues)

                        Catch ex1 As Exception

                        End Try
                    Next
                    'Set the viewer to the report object to be previewed.
                    .ReportSource = lobjCRRptDoc
                    '+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
                End With
                lobjRptForm.OpenReportViewer(vstrRepName, vstrRepTitle, Nothing, lobjCRRptDoc, viRefNumType)

                If viVisibleReport Then
                    lobjRptForm.Show()
                Else
                    lobjRptForm.Visible = False
                End If

            End If
            Return True
ERROR **********************************
{"Invalid index. (Exception from HRESULT: 0x8002000B (DISP_E_BADINDEX))"}
*****************************************

I'll also link a picture for the error details from VB.Net. Any ideas of this would be greatly appreciated after wasting 20 hours fighting with this.
ErrorDetail.png