Object reference not set to an instance of an object. at WaveLibrary.XML.AddNodeParent(String NodeName, String NodeChildName, String NodeChildValue) at WaveLibrary.XML.UpdateNodeValue(String ParentNodeName, String childnode, String NodeValue) at Wave.Modules.WaveSlideshow.ConfigurationSettings.SaveHomePath(String HomePath) at Wave.Modules.WaveSlideshow.View.Page_Load(Object sender, EventArgs e)