出错页面是：https://www.lobn.com.cn/index.aspx?c=course&a=view&id=45520
异常信息：引发类型为“System.Web.HttpUnhandledException”的异常。
Source:System.Web
StackTrace:
   在 System.Web.UI.Page.HandleError(Exception e)
   在 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   在 System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   在 System.Web.UI.Page.ProcessRequest()
   在 System.Web.UI.Page.ProcessRequest(HttpContext context)
   在 ASP.index_aspx.ProcessRequest(HttpContext context)
   在 System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   在 System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
   在 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

InnerException:
System.Reflection.TargetInvocationException: 调用的目标发生了异常。 ---> System.NullReferenceException: 未将对象引用设置到对象的实例。
   在 Kesion.APPCode.VodService.play(DataRow dr, Boolean isMobileDevice, Int32 isfree, Int32 playType, Int32 teachWay, Int32 IsThreeScreen, Int32 IsListening, Int32 qfjiekoy)
   在 Kesion.Course.Course.playMore(DataRow dr, Boolean isMobileDevice, Int32 isfree, Int32 TeachWay)
   在 Kesion.Controllers.courseController.CoursePlayC(Int32 Periodid, String FileStrs, Boolean isMobileDevice, Boolean IsGroupPeriod, Boolean isSchool, Boolean isFromPlayerPage)
   在 Kesion.Controllers.courseController.CourseView(String FileStr, DataRow dr, Boolean isMobileDevice, Int32 teachWay, Boolean isSchool, DataRow drEp)
   在 Kesion.Controllers.courseController.View(Boolean isMobileDevice, Int32 viewId, Boolean isSchool, DataRow drEp)
   在 Kesion.Controllers.courseController.doRun(String a, Boolean isMobileDevice, Boolean isSchool, DataRow drEp)
   在 Kesion.Controllers.courseController.Run(Boolean isMobileDevice)
   --- 内部异常堆栈跟踪的结尾 ---
   在 System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
   在 System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
   在 System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   在 Kesion.NET.WebSite.Index.Page_Load(Object sender, EventArgs e)
   在 System.Web.UI.Control.OnLoad(EventArgs e)
   在 System.Web.UI.Control.LoadRecursive()
   在 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)