ERROR {org.apache.tomcat.util.digester.Digester} -  End event threw exception
java.lang.NoSuchMethodException: org.apache.catalina.deploy.WebXml addServlet
    at org.apache.tomcat.util.IntrospectionUtils.callMethod1(IntrospectionUtils.java:849)
    at org.apache.tomcat.util.digester.SetNextRule.end(SetNextRule.java:201)
    at org.apache.tomcat.util.digester.Digester.endElement(Digester.java:1063)
    at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
    at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
    at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
    at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
    at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1561)
    at org.apache.catalina.startup.ContextConfig.parseWebXml(ContextConfig.java:1843)
    at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1263)
    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:889)
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:386)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5412)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:649)
    at org.wso2.carbon.tomcat.internal.CarbonTomcat.addWebApp(CarbonTomcat.java:290)
    at org.wso2.carbon.tomcat.internal.CarbonTomcat.addWebApp(CarbonTomcat.java:198)
    at org.wso2.carbon.webapp.mgt.TomcatGenericWebappsDeployer.handleWebappDeployment(TomcatGenericWebappsDeployer.java:254)
    at org.wso2.carbon.webapp.mgt.TomcatGenericWebappsDeployer.handleWarWebappDeployment(TomcatGenericWebappsDeployer.java:206)
    at org.wso2.carbon.webapp.mgt.TomcatGenericWebappsDeployer.handleHotDeployment(TomcatGenericWebappsDeployer.java:175)
    at org.wso2.carbon.webapp.mgt.TomcatGenericWebappsDeployer.deploy(TomcatGenericWebappsDeployer.java:140)
    at org.wso2.carbon.webapp.mgt.AbstractWebappDeployer.deployThisWebApp(AbstractWebappDeployer.java:224)
    at org.wso2.carbon.webapp.mgt.AbstractWebappDeployer.deploy(AbstractWebappDeployer.java:114)
    at org.wso2.carbon.webapp.deployer.WebappDeployer.deploy(WebappDeployer.java:42)
    at org.wso2.carbon.webapp.mgt.AbstractWebappDeployer.handleRedeployment(AbstractWebappDeployer.java:511)
    at org.wso2.carbon.webapp.mgt.AbstractWebappDeployer.undeploy(AbstractWebappDeployer.java:293)
    at org.apache.axis2.deployment.DeploymentEngine.unDeploy(DeploymentEngine.java:942)
    at org.apache.axis2.deployment.repository.util.WSInfoList.update(WSInfoList.java:143)
    at org.apache.axis2.deployment.RepositoryListener.update(RepositoryListener.java:377)
    at org.apache.axis2.deployment.RepositoryListener.checkServices(RepositoryListener.java:254)
    at org.apache.axis2.deployment.RepositoryListener.startListener(RepositoryListener.java:371)
    at org.apache.axis2.deployment.scheduler.SchedulerTask.checkRepository(SchedulerTask.java:59)
    at org.apache.axis2.deployment.scheduler.SchedulerTask.run(SchedulerTask.java:67)