does not exist or is not a readable directory 这是什么错误啊?

does not exist or is not a readable directory 这是什么错误啊?严重:Error starting static Resourcesjava.lang.IllegalArgumentException:Document base D:\XUZB2A_VacAgent\WebRoot does not exist or is not a readable directoryat org.apache.naming.resources.FileDirContext.setDocBase(FileDirContext.java:141)at org.apache.catalina.core.StandardContext.resourcesStart(StandardContext.java:3895)at org.apache.catalina.core.StandardContext.start(StandardContext.java:4064)at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:760)at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:740)at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:544)at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:634)at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:561)at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:496)at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1203)at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:319)at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120)at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1022)at org.apache.catalina.core.StandardHost.start(StandardHost.java:736)at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)at org.apache.catalina.core.StandardService.start(StandardService.java:448)at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)at org.apache.catalina.startup.Catalina.start(Catalina.java:552)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:585)at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)2011-1-27 15:32:25 org.apache.catalina.core.StandardContext start严重:Error in resourceStart()2011-1-27 15:32:25 org.apache.catalina.core.StandardContext start严重:Error getConfigured2011-1-27 15:32:25 org.apache.catalina.core.StandardContext start严重:Context [/admin] startup failed due to previous errors2011-1-27 15:32:25 org.apache.catalina.core.StandardContext stop信息:Container org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/admin] has not been started