[NullReferenceException: 未将对象引用设置到对象的实例。]
CRIC.Shanglv.Web.DiChanRen.Areas.Education.Controllers.CourseController.ClassDetails(Int32 id) in d:\devcode\www.dichanren.com\trunk\CRIC.Shanglv.Web.DiChanRen\CRIC.Shanglv.Web.DiChanRen\Areas\Education\Controllers\CourseController.cs:296
lambda_method(Closure , ControllerBase , Object[] ) +140
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +266
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +34
System.Web.Mvc.<>c__DisplayClass15.<InvokeActionMethodWithFilters>b__12() +78
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +453
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +632
System.Web.Mvc.Controller.ExecuteCore() +144
System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +93
System.Web.Mvc.<>c__DisplayClassb.<BeginProcessRequest>b__5() +57
System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +25
System.Web.Mvc.<>c__DisplayClasse.<EndProcessRequest>b__d() +54
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +431
System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +75
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +158
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