ERROR-while SAML Parse in Open Saml 3.1.1

[Sandeep urs]

Hi,
We are using OpenSaml 3.1.1  and while we are parsing  the SAMLResponse and
we are receiving exception as follows

Exception:
net.shibboleth.utilities.java.support.component.UninitializedComponentException:
Component has not yet been initialized and cannot be used.

Pseudo code for parsing ::

           String decodeResponse =
(String)Base64Support.decode(responseMessage);
Document document = null;
org.opensaml.core.xml.io.Unmarshaller unmarshaller = null;
BasicParserPool parserPoolManager = new BasicParserPool();
decodeResponse.getBytes();
* document = parserPoolManager.parse(new
ByteArrayInputStream(decodeResponse.getBytes()));*
Element metadataRoot = document.getDocumentElement();
QName qName = new
QName(metadataRoot.getNamespaceURI(),metadataRoot.getLocalName(),
metadataRoot.getPrefix());
unmarshaller=
org.opensaml.core.xml.util.XMLObjectSupport.getUnmarshaller(qName);

Please suggest...
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