نرم افزارهای ضروری

{"success":false,"message":"System.NullReferenceException: Object reference not set to an instance of an object.\r\n at ASP._Page_Views_Category_SpecialSoftwareList_cshtml.Execute() in E:\\vhost\\download\\Views\\Category\\SpecialSoftwareList.cshtml:line 10\r\n at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()\r\n at System.Web.Mvc.WebViewPage.ExecutePageHierarchy()\r\n at System.Web.WebPages.StartPage.ExecutePageHierarchy()\r\n at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)\r\n at System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context)\r\n at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)\r\n at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)\r\n at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult)\r\n at System.Web.Mvc.Async.AsyncControllerActionInvoker.\u003c\u003ec__DisplayClass21.\u003cBeginInvokeAction\u003eb__1e(IAsyncResult asyncResult)"}