Error Caught in Page_Error event

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Error in: http://gw.ace-medical.com/common/download2.aspx
Error Message: 'System.Web.HttpUnhandledException' 형식의 예외가 Throw되었습니다.
Error Source: System.Web
Error InnerException: System.NullReferenceException: 개체 참조가 개체의 인스턴스로 설정되지 않았습니다. 위치: ASP.common_download2_aspx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) 파일 C:\GwareNet13.45\common\download2.aspx:줄 47 위치: System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) 위치: System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) 위치: System.Web.UI.Page.Render(HtmlTextWriter writer) 위치: System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) 위치: System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) 위치: System.Web.UI.Control.RenderControl(HtmlTextWriter writer) 위치: System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
Stack Trace:
위치: System.Web.UI.Page.HandleError(Exception e) 위치: System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) 위치: System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) 위치: System.Web.UI.Page.ProcessRequest() 위치: System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) 위치: System.Web.UI.Page.ProcessRequest(HttpContext context) 위치: ASP.common_download2_aspx.ProcessRequest(HttpContext context) 위치: System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() 위치: System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) 위치: System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)