problème de configuration Hibernate

Bonjour la liste,
J'exécute mon application sous eclipse utilisant Hibernate, seulement lorsque je lance l'éxécution l'exception suivante est levée :

Code:

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log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "main" java.lang.RuntimeException: Probleme de configuration : Could not configure datastore from file: D:\chemin_mapping\fichier.xml
	at Projet.HibernateUtil.<init>(HibernateUtil.java:471)
	at test.Test.main(Test.java:17)
Caused by: org.hibernate.MappingException: Could not configure datastore from file: D:\chemin_mapping\fichier.xml
	at org.hibernate.cfg.Configuration.addFile(Configuration.java:233)
	at Projet.HibernateUtil.<init>(HibernateUtil.java:17)
	... 1 more
Caused by: org.hibernate.MappingException: invalid mapping
	at org.hibernate.cfg.Configuration.addFile(Configuration.java:227)
	... 2 more
Caused by: org.xml.sax.SAXParseException: Element type "hibernate-mapping" must be declared.
	at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
	at org.apache.xerces.util.ErrorHandlerWrapper.error(Unknown Source)
	at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
	at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
	at org.apache.xerces.impl.dtd.XMLDTDValidator.handleStartElement(Unknown Source)
	at org.apache.xerces.impl.dtd.XMLDTDValidator.startElement(Unknown Source)
	at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
	at org.apache.xerces.impl.XMLNSDocumentScannerImpl$NSContentDispatcher.scanRootElementHook(Unknown Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
	at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
	at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
	at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
	at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
	at org.dom4j.io.SAXReader.read(SAXReader.java:465)
	at org.dom4j.io.SAXReader.read(SAXReader.java:264)
	at org.hibernate.cfg.Configuration.addFile(Configuration.java:226)
	... 2 more

Le chemin des fichiers de mapping "D:\chemin_mapping\fichier.xml" est correct, je ne comprends pas donc pourquoi cette erreur est générée

Merci d'avance pour votre aide