Content is not allowed in prolog.

Bonjour voici mon erreur d'ou vient elle??
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GRAVE: Parse Fatal Error at line 1 column 1: Content is not allowed in prolog.
org.xml.sax.SAXParseException: Content is not allowed in prolog.
	at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
	at org.apache.xerces.util.ErrorHandlerWrapper.fatalError(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.XMLScanner.reportFatalError(Unknown 
Source)
	at org.apache.xerces.impl.XMLDocumentScannerImpl$PrologDispatcher.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.apache.commons.digester.Digester.parse(Digester.java:1548)
	at org.apache.catalina.startup.ContextConfig.applicationConfig(ContextConfig.java:263)
	at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:624)
	at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:216)
	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4290)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083)
	at org.apache.catalina.core.StandardHost.start(StandardHost.java:789)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083)
	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:478)
	at org.apache.catalina.core.StandardService.start(StandardService.java:480)
	at org.apache.catalina.core.StandardServer.start(StandardServer.java:2313)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:556)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:287)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:425)
30 août 2007 10:26:26 org.apache.catalina.startup.ContextConfig applicationConfig
GRAVE: Erreur d'évaluation (parse) dans le fichier web.xml de l'application
org.xml.sax.SAXParseException: Content is not allowed in prolog.
	at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
	at org.apache.commons.digester.Digester.parse(Digester.java:1548)
	at org.apache.catalina.startup.ContextConfig.applicationConfig(ContextConfig.java:263)
	at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:624)
	at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:216)
	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4290)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083)
	at org.apache.catalina.core.StandardHost.start(StandardHost.java:789)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083)
	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:478)
	at org.apache.catalina.core.StandardService.start(StandardService.java:480)
	at org.apache.catalina.core.StandardServer.start(StandardServer.java:2313)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:556)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:287)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:425)
30 août 2007 10:26:26 org.apache.catalina.startup.ContextConfig applicationConfig
GRAVE: S'est produite à la ligne 1 colonne 1
que dois je faire??