java.lang.StringIndexOutOfBoundsException: String index out of range: 34

Dear Gurus

I m reading XML file in the form of string.
Below is the code.

=> XML string that pass to parseDocument(String receivedMessage) in
Parser class as follows

<?xml version="1.0" encoding="UTF-8"?>
 <IFX xmlns:pain001="urn:swift:xsd:$pain.001.001.01"
         xmlns:pain002="urn:swift:xsd:$pain.002.001.01"
         xmlns:pain004="urn:swift:xsd:$pain.004.001.01"
         xmlns:remit="http://www.ifxforum.org/RemitDetailInfo/
2004/07"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:noNamespaceSchemaLocation="C:\IFX170_XSD.xsd" >
   <SignonRq>
     <ClientDt>2006-02-16</ClientDt>
     <CustLangPref>EN</CustLangPref>
     <ClientApp>
       <Org>abc</Org>
       <Name>a</Name>
       <Version>1</Version>
     </ClientApp>
   </SignonRq>
   <BankSvcRq>
     <RqUID>51dc8bf5-70c3-4e36-8d03-d0fb5fc58fbd</RqUID>
       <XferAddRq>
      <RqUID>51dc8bf5-70c3-4e36-8d03-d0fb5fc58fbd</RqUID>
         <XferInfo>
           <DepAcctIdFrom>
             <AcctId>112</AcctId>
             <AcctType/>
             <AcctCur>INR</AcctCur>
             <BankInfo/>
           </DepAcctIdFrom>
           <DepAcctIdTo>
             <AcctId>54</AcctId>
             <AcctType/>
             <AcctCur>4</AcctCur>
             <BankInfo/>
           </DepAcctIdTo>
           <CurAmt>
              <Amt>2450</Amt>
          </CurAmt>
         </XferInfo>
       </XferAddRq>
     </BankSvcRq>
   </IFX>

=> Parser which parse the above string as below
.. . . . . . .
.. . . . . . .
    private void parseDocument(String receivedMessage) {
        SAXParserFactory spf = SAXParserFactory.newInstance();
        try {
            //get a new instance of parser
            SAXParser sp = spf.newSAXParser();

           //parse the file and also register this class for call backs
           sp.parse(new InputSource(new
ByteArrayInputStream(receivedMessage.getBytes())), this);
        }catch(SAXException se) {
        }catch(ParserConfigurationException pce) {
        }catch (IOException ie) {
    }
.. . . . . . .
.. . . . . . .

In this code I m getting error on line started with "sp.parse(new
InputSource(new ........."
Stack trace of error as below
org.xml.sax.SAXParseException: Content is not allowed in prolog.
        at

com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:
236)
        at
com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:
215)
        at
com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:
386)
        at
com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:
316)
        at
com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:
1438)
java.lang.StringIndexOutOfBoundsException: String index out of range:
34

Could Any one help why I m getting this error..

Thanking in Advance
Regards
Sanjeev