Server Error in '/' Application.

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Line 19:     protected void Page_Load(object sender, EventArgs e)
Line 20:     {
Line 21:         Response.Redirect("http://walks.walkingworld.com/View/" + Request.QueryString["wlkno"].ToString() + "/Walk.aspx");
Line 22:     }
Line 23: }

[NullReferenceException: Object reference not set to an instance of an object.]
   CMSWebParts_Walkingworld_walkredirect.Page_Load(Object sender, EventArgs e) in d:\domains\walkingworld.com\httpdocs\CMSWebParts\Walkingworld\walkredirect.ascx.cs:21
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.Web.UI.Control.OnLoad(EventArgs e) +99
   CMS.PortalControls.CMSAbstractWebPart.OnLoad(EventArgs e) +191
   System.Web.UI.Control.LoadRecursive() +50
   System.Web.UI.Control.LoadRecursive() +141
   System.Web.UI.Control.LoadRecursive() +141
   System.Web.UI.Control.LoadRecursive() +141
   System.Web.UI.Control.LoadRecursive() +141
   System.Web.UI.Control.LoadRecursive() +141
   System.Web.UI.Control.LoadRecursive() +141
   System.Web.UI.Control.LoadRecursive() +141
   System.Web.UI.Control.LoadRecursive() +141
   System.Web.UI.Control.LoadRecursive() +141
   System.Web.UI.Control.LoadRecursive() +141
   System.Web.UI.Control.LoadRecursive() +141
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627