Error convertoring HTML to XHTML: System.ArgumentException: Invalid name character in ':namespace'.
at System.Xml.XmlTextWriter.ValidateName(String name, Boolean NCName)
at System.Xml.XmlTextWriter.InternalWriteProcessingInstruction(String name, String text)
at System.Xml.XmlTextWriter.WriteProcessingInstruction(String name, String text)
at System.Xml.XmlWriter.WriteNode(XmlReader reader, Boolean defattr)
at FreeTextBoxControls.Support.Formatter.HtmlToXhtml(String input)