crystal report converted from 1.0 to 4.0 .NET not working

I have inherited a website designed in .NET framework 1.0. I have to convert to new 4.0 NET framework. Everything else works except the crystal report page.

Here is the code for the page:

public distance_grp oRpt = null;
            public wcn_distance_grp wcn_oRpt = null;

            private void Page_Load(object sender, System.EventArgs e)
            {
                  //
                  // Verify access to page
                  //
                  PageAccessManager.VerifyAccessOrRedirectToLogin(this.Page);
                  string sMemberName = this.Session["PageAccessManager.MemberName"].ToString();
                  string sPagename = this.Page.Request.Path;
                  PageAccessManager.LogMemberActivity(sMemberName,sPagename,"READ",null,null,null,null);
                  //
                  // Set up SQL parameters
                  //
                  string stringZipCode = Request.QueryString["ZipCode"];
                  string stringRadius = Request.QueryString["Radius"];
                  string stringSpecialtyCode = Request.QueryString["Specialty"];
                  string stringSpecialtyId = Request.QueryString["SpecialtyId"];
                  string stringClassId = Request.QueryString["ClassId"];
                  string stringClass = Request.QueryString["Class"];
                  //
                  // Set up the titles in the report
                  //
                  string stringTitle1 = stringClass;
                  string stringTitle2 = "Within " + stringRadius + " mile(s) of " +  stringZipCode;
                  
                  //determine where it came from
                  string stringFrom = "";
                  if ( Request.QueryString["fr"] != null)
                        stringFrom = Request.QueryString["fr"];


                  // create the report instance
                  if (stringFrom =="")
                        oRpt = new  distance_grp();
                  else
                        wcn_oRpt = new wcn_distance_grp();
                  

                  // fill dataset
                  string stringConnectionString = Administrator.ConnectionString;
                  SqlConnection connectionInformedCare = new SqlConnection(stringConnectionString);
                  SqlDataAdapter adapterPM = new SqlDataAdapter(); //stringSQLSelect, connectionInformedCare);
                  SqlCommand oCmd = new SqlCommand("procedureProvidersByDistanceGet", connectionInformedCare);
                  oCmd.CommandType  = System.Data.CommandType.StoredProcedure;
                  oCmd.Parameters.Add("@ZipCode", stringZipCode);
                  oCmd.Parameters.Add("@SpecCodeId",stringSpecialtyId);
                  oCmd.Parameters.Add("@ClassCodeId",stringClassId);
                  oCmd.Parameters.Add("@Radius", stringRadius);
                  oCmd.Parameters.Add("@MemberName",this.Session["PageAccessManager.MemberName"].ToString());
                  connectionInformedCare.Open();
                  adapterPM.SelectCommand=oCmd;
                  DataSet dataSet = new DataSet();
                  adapterPM.Fill (dataSet, "procedureProvidersByDistanceGet");
                  connectionInformedCare.Close();
                  connectionInformedCare.Dispose();

            try
            {

                // set report data source
                if (stringFrom != "")
                    wcn_oRpt.SetDataSource(dataSet);
                else
                    oRpt.SetDataSource(dataSet.Tables[0]);
            }
            catch (Exception excp)
            {
                string msg = excp.Message;
                Response.Write(msg);

            }

                  // Set export params
                  CrystalDecisions.Shared.ExportOptions exp = new CrystalDecisions.Shared.ExportOptions();
                  exp.ExportFormatType  = CrystalDecisions.Shared.ExportFormatType.PortableDocFormat;
                  exp.FormatOptions = new CrystalDecisions.Shared.PdfRtfWordFormatOptions();
                  CrystalDecisions.Shared.ExportRequestContext req = new CrystalDecisions.Shared.ExportRequestContext();
                  req.ExportInfo = exp;

                  CrystalDecisions.Shared.ParameterValues crParameterValues;
                  ParameterFieldDefinitions crParameterFieldDefinitions;
                  ParameterFieldDefinition crParameterFieldDefinition;
   
                  // get field defs collection
                  if (stringFrom == "")
                        crParameterFieldDefinitions = oRpt.DataDefinition.ParameterFields;
                  else
                        crParameterFieldDefinitions = wcn_oRpt.DataDefinition.ParameterFields;
                  
                  // Get fields def
                  crParameterFieldDefinitions.MoveNext();
                  crParameterFieldDefinition = (ParameterFieldDefinition)crParameterFieldDefinitions.Current;
                  
                  // get values collection
                  crParameterValues = crParameterFieldDefinition.CurrentValues;

--------------------------------------------------------

THE ERROR SHOWS UP ON THIS LINE OF CODE
crParameterFieldDefinition = (ParameterFieldDefinition)crParameterFieldDefinitions.Current;

"value does not fall within the expected range "

I'm not sure what's going on here. Please help!