DOMBuilder parse() method throws UTFDataFormatException

[Jena, Prasant Kumar \(Prasant Kumar\)]

 
Hi,
I am using Xeces 2.5 , I am using DOMBuilder to parse the XML file.

Here is the code in my application

        MemBufInputSource* pInputXml = new MemBufInputSource
                    (   (const XMLByte*)( buff )
                    ,   strlen( buff )
                    ,   xmlFile
                    ,   false       
                    );

       Wrapper4InputSource inputXmlWrapper
               (   pInputXml       
               ,   true            
               );

       DOMInputSource* pDomInput = &inputXmlWrapper;
       doc = DomBuilderObj->parse (*pDomInput);
But it always throws UTFDataFormatException

Fatal Error at file tt.xml, line 1, char 56
  Message: An exception occurred! Type:UTFDataFormatException, Message:invalid 
byte 2 (═) of a 2-byte sequence.

XML header is like
<?xml version="1.0" encoding="UTF-8" standalone="no" ?>

Can you please figure out what may be the cause of this problem.

Thanks,
Prasant