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Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]
java.lang.IllegalArgumentException: Servlet mapping specifies an unknown servlet name AdminServlet	at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3212)	at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3191)	at org.apache.catalina.deploy.WebXml.configureContext(WebXml.java:1302)	at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1305)	at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:855)	at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:346)	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.StandardContext.startInternal(StandardContext.java:5172)	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1595)	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1585)	at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)	at java.util.concurrent.FutureTask.run(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)