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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 DKSOFT.CODE.MVC4.Controllers.UrlController.DetailLanguage(String language, String categorycode, String detail) +1967 lambda_method(Closure , ControllerBase , Object[] ) +238 System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +229 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) +982 System.Web.Mvc.Controller.ExecuteCore() +129 DKSOFT.CODE.MVC4.Controllers.BaseController.ExecuteCore() +490 System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +236 System.Web.Mvc.Async.AsyncResultWrapper.<.cctor>b__0(IAsyncResult asyncResult, Action action) +21 System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +59 System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +44 System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +65 System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +59 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:4.6.1590.0

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