Error rendering error page.

System.ArgumentNullException: Value cannot be null.
Parameter name: source
   at System.Linq.Enumerable.Where[TSource](IEnumerable`1 source, Func`2 predicate)
   at i18n.DBLocalizingService.GetBestAvailableLanguageFrom(String[] languages) in D:\Projects\Ra-argo\__app\i18n\DBLocalizingService.cs:line 26
   at i18n.Interface.I18NSession.GetLanguageFromSessionOrService(HttpContextBase context) in D:\Projects\Ra-argo\__app\i18n\Interface\I18NSession.cs:line 62
   at i18n.LanguageFilter.OnActionExecuting(ActionExecutingContext filterContext) in D:\Projects\Ra-argo\__app\i18n.MVC3\LanguageFilter.cs:line 42
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
   at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)
   at System.Web.Mvc.Controller.ExecuteCore()
   at System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext)
   at BaseApp.Web.Code.Filters.ServerErrorResult.ExecuteResult(HttpContextBase context) in D:\Projects\Ra-argo\__app\BaseApp.Web\Code\Filters\ServerErrorResult.cs:line 50