[InvalidOperationException: Sequence contains no elements]
System.Linq.Enumerable.First(IEnumerable`1 source) +335
System.Data.Entity.Core.Objects.ELinq.ObjectQueryProvider.<GetElementFunction>b__0(IEnumerable`1 sequence) +40
System.Data.Entity.Core.Objects.ELinq.ObjectQueryProvider.ExecuteSingle(IEnumerable`1 query, Expression queryRoot) +60
System.Data.Entity.Core.Objects.ELinq.ObjectQueryProvider.System.Linq.IQueryProvider.Execute(Expression expression) +113
System.Data.Entity.Internal.Linq.DbQueryProvider.Execute(Expression expression) +105
System.Linq.Queryable.First(IQueryable`1 source, Expression`1 predicate) +260
FullMvcApplication.Controllers.CoursesController.GetCourseById(Int32 id) +235
FullMvcApplication.Controllers.CoursesController.Details(Int32 id) +34
lambda_method(Closure , ControllerBase , Object[] ) +97
System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) +19
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +224
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +27
System.Web.Mvc.<>c__DisplayClass15.<InvokeActionMethodWithFilters>b__12() +57
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +260
System.Web.Mvc.<>c__DisplayClass17.<InvokeActionMethodWithFilters>b__14() +26
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +205
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +326
System.Web.Mvc.Controller.ExecuteCore() +109
System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +92
System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) +12
System.Web.Mvc.<>c__DisplayClassb.<BeginProcessRequest>b__5() +34
System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +16
System.Web.Mvc.Async.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _) +15
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +59
System.Web.Mvc.<>c__DisplayClasse.<EndProcessRequest>b__d() +48
System.Web.Mvc.SecurityUtil.<GetCallInAppTrustThunk>b__0(Action f) +12
System.Web.Mvc.SecurityUtil.ProcessInApplicationTrust(Action action) +24
System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +66
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +11
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9850389
System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +50
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +163
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