Crystal Report to PDF

I am trying to send the data from a single record to a Crstal Report that I created and then create a PDF from that report that I can Print.  This is the error message that i get 

Exception Details: CrystalDecisions.CrystalReports.Engine.DataSourceException: The data source object is invalid.

Can anyone help me this this? 

Thank You

This is the ActionResult that I created.

  public ActionResult ExportReport(int? id)
          {

            InjuryIllness i = db.InjuryIllnesses.Find(id);
            ReportDocument rd = new ReportDocument();
            rd.Load(Path.Combine(Server.MapPath("~/Reports"), "Report_InjuryIllness.rpt"));
           rd.SetDataSource(i);
          
            Response.Buffer = false;
            Response.ClearContent();
            Response.ClearHeaders();
 
            try
                 {
                    Stream stream = rd.ExportToStream(CrystalDecisions.Shared.ExportFormatType.PortableDocFormat);
                    stream.Seek(0, SeekOrigin.Begin);
                    return File(stream, "application/pdf", "Report_InjuryIllness.pdf");
                 }
            catch (Exception ex)
                {
                throw;
                }
        }