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/nSystem.NullReferenceException: Object reference not set to an instance of an object. at System.Xml.XmlNodeReaderNavigator..ctor(XmlNode node) at System.Xml.XmlNodeReader.Init(XmlNode node) at System.Xml.XmlNodeReader..ctor(XmlNode node) at TSBC.SBO.BO.Lesson.doTransform(XmlNode pageNode, Int32 currentPage) at TSBC.SBO.BO.Lesson.renderLesson(Int32 currentPage) at TSBC.OnlineTraining1_8.viewLesson.Page_Load(Object sender, EventArgs e)