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Server Error in '/' Application.

Sequence contains no elements

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.InvalidOperationException: Sequence contains no elements Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[InvalidOperationException: Sequence contains no elements] System.Linq.Enumerable.First(IEnumerable`1 source) +415 bonlayn.data.Repositories.ProductCategoryRepository.GetBySlug(String slug) in D:\Vu Ngoc Diep\Changeshop-fullScreen\bonlayn.data\Repositories\ProductCategoryRepository.cs:39 bonlayn.Controllers.ProductController.DanhMuc(Nullable`1 page, String id, String orderby) in D:\Vu Ngoc Diep\Changeshop-fullScreen\bonlayn\Controllers\ProductController.cs:131 lambda_method(Closure , ControllerBase , Object[] ) +250 System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +280 System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +35 System.Web.Mvc.<>c__DisplayClass15.<InvokeActionMethodWithFilters>b__12() +80 System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +453 System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +663 System.Web.Mvc.Controller.ExecuteCore() +144 System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +92 System.Web.Mvc.<>c__DisplayClassb.<BeginProcessRequest>b__5() +58 System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +22 System.Web.Mvc.<>c__DisplayClasse.<EndProcessRequest>b__d() +36 System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +399 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +157
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.6.1586.0

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