javax.servlet.UnavailableException: This exception has no message.

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javax.servlet.UnavailableException:
at org.apache.struts.action.ActionServlet.initModulePlugIns(ActionServlet.java:880)
at javax.servlet.GenericServlet.init(GenericServlet.java:256)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1044)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:887)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3959)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4284)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:866)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:850)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:638)
at org.apache.catalina.core.StandardHostDeployer.install(StandardHostDeployer.java:320)
at org.apache.catalina.core.StandardHost.install(StandardHost.java:875)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:727)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:477)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1008)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:394)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:166)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1134)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:832)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1126)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:521)
at org.apache.catalina.core.StandardService.start(StandardService.java:519)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:2345)
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:324)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:297)

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