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java.lang.NullPointerException: 	at org.apache.catalina.core.ContainerBase.removeChild(ContainerBase.java:923)	at org.apache.catalina.startup.HostConfig.undeployApps(HostConfig.java:1357)	at org.apache.catalina.startup.HostConfig.stop(HostConfig.java:1328)	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:326)	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)	at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1094)	at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1106)	at org.apache.catalina.core.StandardEngine.stop(StandardEngine.java:468)	at org.apache.catalina.core.StandardService.stop(StandardService.java:604)	at org.apache.catalina.core.StandardServer.stop(StandardServer.java:788)	at org.apache.catalina.startup.Catalina.stopServer(Catalina.java:408)	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.stopServer(Bootstrap.java:338)	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:416)