Error Caught in Page_Error event

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Error in: http://gw.ace-medical.com/common/upload_file.aspx
Error Message: 'System.Web.HttpUnhandledException' 형식의 예외가 Throw되었습니다.
Error Source: System.Web
Error InnerException: System.ArgumentNullException: 값은 null일 수 없습니다. 매개 변수 이름: path 위치: System.IO.Directory.CreateDirectory(String path) 위치: GWare.Net.upload_file.Page_Load(Object sender, EventArgs e) 위치: System.Web.UI.Control.OnLoad(EventArgs e) 위치: System.Web.UI.Control.LoadRecursive() 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_upload_file_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)