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java.lang.NullPointerException: 	at org.apache.commons.digester.Digester.getXMLReader(Digester.java:1058)	at org.apache.commons.digester.Digester.parse(Digester.java:1887)	at org.apache.tiles.definition.digester.DigesterDefinitionsReader.read(DigesterDefinitionsReader.java:267)	at org.apache.tiles.definition.UrlDefinitionsFactory.readDefinitions(UrlDefinitionsFactory.java:286)	at org.apache.tiles.definition.UrlDefinitionsFactory.init(UrlDefinitionsFactory.java:130)	at org.apache.tiles.impl.BasicTilesContainer.initializeDefinitionsFactory(BasicTilesContainer.java:406)	at org.apache.tiles.impl.BasicTilesContainer.init(BasicTilesContainer.java:130)	at org.apache.tiles.factory.TilesContainerFactory.initializeContainer(TilesContainerFactory.java:232)	at org.apache.tiles.factory.TilesContainerFactory.createTilesContainer(TilesContainerFactory.java:198)	at org.apache.tiles.factory.TilesContainerFactory.createContainer(TilesContainerFactory.java:163)	at org.apache.tiles.web.startup.TilesListener.createContainer(TilesListener.java:90)	at org.apache.struts2.tiles.StrutsTilesListener.createContainer(StrutsTilesListener.java:68)	at org.apache.tiles.web.startup.TilesListener.contextInitialized(TilesListener.java:57)	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3827)	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4334)	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)	at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:920)	at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:883)	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)	at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1138)	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)	at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)	at org.apache.catalina.core.StandardService.start(StandardService.java:516)	at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)	at org.apache.catalina.startup.Catalina.start(Catalina.java:566)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:601)