Error while deserialize XML Files

Hello,
I have few xml files and I am attempting to deserialize but I am getting fail due to the following error message. Does anybody know what this is and how to resolve this? Please let me know I shall be thankful to you.

Critical Error
There is an error in the XML document.
at System.XmI.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader, String encodingStyle, XmlDeserializationEvents events)
at SystemXmI.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader)
at Microsoft.Web.Services3.SoapEnvelope.GetBodyObject(Type bodyType, String defaultNamespace)
at
DoenaSoft.AsinToEanConverter.AWSECommerceServiceJtemLookup(It emLookup ItemLookupi)
at DoenaSoftAsinToEanC onverterAmazonAccess.Update(String asin, String domain, Dictionaryl associateTags, ItemAttributes&
itemAttributes)
OK
