Server Error in '/' Application.

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Line 3:      string strId=Request.Params["url"];
Line 4:      string[] newsId=strId.Split('/');
Line 5:      Page.title=newsId[3];
Line 6:      var Id=newsId[2];
Line 7:  

[IndexOutOfRangeException: Index was outside the bounds of the array.]
   ASP._Page_rcAddons_nmgNews__addon_nmgNews_FullContent_01_cshtml.Execute() in c:\inetpub\Host\mazandnume.com\www\rcAddons\nmgNews\_addon_nmgNews_FullContent_01.cshtml:5
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +252
   System.Web.WebPages.WebPage.ExecutePageHierarchy(IEnumerable`1 executors) +99
   System.Web.WebPages.WebPage.ExecutePageHierarchy() +185
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +122
   System.Web.WebPages.<>c__DisplayClass7.<RenderPageCore>b__6(TextWriter writer) +327
   System.Web.WebPages.WebPageBase.Write(HelperResult result) +123
   ASP.<>c__DisplayClass4f.<Execute>b__4b() in c:\inetpub\Host\mazandnume.com\www\Default.cshtml:91
   System.Web.WebPages.<>c__DisplayClassb.<RenderSection>b__9(TextWriter tw) +414
   System.Web.WebPages.WebPageBase.Write(HelperResult result) +123
   ASP._Page_rcLayouts__rcFullContent_01_cshtml.Execute() in c:\inetpub\Host\mazandnume.com\www\rcLayouts\_rcFullContent_01.cshtml:104
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +252
   System.Web.WebPages.WebPage.ExecutePageHierarchy(IEnumerable`1 executors) +99
   System.Web.WebPages.WebPage.ExecutePageHierarchy() +185
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +122
   System.Web.WebPages.<>c__DisplayClass7.<RenderPageCore>b__6(TextWriter writer) +327
   System.Web.WebPages.WebPageBase.Write(HelperResult result) +123
   System.Web.WebPages.WebPageBase.RenderSurrounding(String partialViewName, Action`1 body) +88
   System.Web.WebPages.WebPageBase.PopContext() +349
   System.Web.WebPages.WebPageHttpHandler.ProcessRequestInternal(HttpContextBase httpContext) +142