最近经常报错，请问是什么原因？fiddler2

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Uncaught Exception in Session #6

Fiddler has encountered an unexpected problem. If you believe this is a bug in Fiddler, please copy this message by hitting CTRL+C, and submit a bug report using the Help | Send Feedback menu.

未将对象引用设置到对象的实例。

Type: System.NullReferenceException Source: Rosin 在 Rosin.ConfigControl.UpdateLogText()

在 Rosin.ConfigControl.RosinWriteHandler(Object serder, EventArgs e)

在 Rosin.Interceptor.FilterAndRecord(Session oSession)

在 Rosin.Main.AutoTamperRequestBefore(Session oSession)

在 Fiddler.FiddlerExtensions.DoAutoTamperRequestBefore(Session oSession)

在 Fiddler.Session._executeObtainRequest()

在 Fiddler.Session.InnerExecute()

在 Fiddler.Session.Execute(Object objThreadState)

Fiddler v2.3.9.5 (x64 AMD64) [.NET 2.0.50727.5420 on Microsoft Windows NT 6.1.7601 Service Pack 1]