How to know what to complain about asp.net iis application?

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Hello asp.net produces here such error

[NullReferenceException: Object reference not set to an instance of an object.] RP.WebUI.Arm1Search.SetDataSet(DataSet ds) +16 RP.WebUI.Arm1Search.RestoreCriteria() +603 RP.WebUI.Arm1Search.Page_Load(Object sender, EventArgs e) +975 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 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.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627


How can you understand in what file and where this error?
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1 Answer

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Classic. A La "the diagnosis on photos is 16x16px".
A flaw in RP.WebUI.Arm1Search.SetDataSet(DataSet ds) +16 instructions from the beginning of the method. As it is written.
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