read xml with check DTD valid or invalid using vb.net

Unexpected end of file while parsing comment has occurred.line 57,position 69,when read xml file.why did come this error?How to resolve this error?

 

Imports System.Xml

Imports System.Xml.Schema

Module Module1

Private isValid As Boolean = True

Sub Main()

Dim XMLPath As String = "D:\Karpagam\files1\xmlfiles\04-CHAPTER-4.xml"

' Set the validation settings.

Dim settings As XmlReaderSettings = New XmlReaderSettings()

settings.DtdProcessing = DtdProcessing.Parse

settings.ValidationType = ValidationType.DTD

settings.ValidationFlags = XmlSchemaValidationFlags.ReportValidationWarnings

settings.ValidationFlags = XmlSchemaValidationFlags.ProcessInlineSchema

AddHandler settings.ValidationEventHandler, AddressOf ValidationCallBack

' Create the XmlReader object.

Dim reader As XmlReader = XmlReader.Create(XMLPath, settings)

' Parse the file.

While reader.Read()

End While