Error Caught in Page_Error event

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Error in: https://www.sorooshan.com/news/Default.aspx?g=2&nid=361
Error Message: Object reference not set to an instance of an object.
Stack Trace:
at news_Default.Page_Load(Object sender, EventArgs e) at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) at System.Web.UI.Control.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)