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java.lang.NullPointerException: 	at com.liferay.portlet.InvokerPortletImpl.(InvokerPortletImpl.java:169)	at com.liferay.portlet.InvokerPortletFactoryImpl.create(InvokerPortletFactoryImpl.java:56)	at com.liferay.portlet.PortletInstanceFactoryImpl.init(PortletInstanceFactoryImpl.java:225)	at com.liferay.portlet.PortletInstanceFactoryImpl.create(PortletInstanceFactoryImpl.java:145)	at com.liferay.portlet.PortletInstanceFactoryUtil.create(PortletInstanceFactoryUtil.java:41)	at com.liferay.portlet.PortletBagFactory.create(PortletBagFactory.java:337)	at com.liferay.portal.deploy.hot.PortletHotDeployListener.doInvokeDeploy(PortletHotDeployListener.java:370)	at com.liferay.portal.deploy.hot.PortletHotDeployListener.invokeDeploy(PortletHotDeployListener.java:125)	at com.liferay.portal.deploy.hot.HotDeployImpl.doFireDeployEvent(HotDeployImpl.java:227)	at com.liferay.portal.deploy.hot.HotDeployImpl.fireDeployEvent(HotDeployImpl.java:96)	at com.liferay.portal.kernel.deploy.hot.HotDeployUtil.fireDeployEvent(HotDeployUtil.java:28)	at com.liferay.portal.kernel.servlet.PluginContextListener.fireDeployEvent(PluginContextListener.java:164)	at com.liferay.portal.kernel.servlet.PluginContextListener.doPortalInit(PluginContextListener.java:154)	at com.liferay.portal.kernel.util.BasePortalLifecycle.portalInit(BasePortalLifecycle.java:44)	at com.liferay.portal.kernel.util.PortalLifecycleUtil.register(PortalLifecycleUtil.java:74)	at com.liferay.portal.kernel.util.PortalLifecycleUtil.register(PortalLifecycleUtil.java:58)	at com.liferay.portal.kernel.util.BasePortalLifecycle.registerPortalLifecycle(BasePortalLifecycle.java:54)	at com.liferay.portal.kernel.servlet.PluginContextListener.contextInitialized(PluginContextListener.java:116)	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4939)	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434)	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)	at org.apache.catalina.core.StandardContext.reload(StandardContext.java:3954)	at org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1270)	at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1439)	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:315)	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)	at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)	at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1374)	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1530)	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1540)	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1519)	at java.lang.Thread.run(Unknown Source)