如图，我不小心点了restore myeclipse tomcat server installation
然后如果我点击remove deployment会出现以下错误：
严重: Exception sending context destroyed event to listener instance of class com.sun.faces.application.WebappLifecycleListener
java.lang.NoClassDefFoundError: com/sun/faces/spi/InjectionProviderException
at com.sun.faces.application.WebappLifecycleListener.handleAttributeEvent(WebappLifecycleListener.java:224)
at com.sun.faces.application.WebappLifecycleListener.contextDestroyed(WebappLifecycleListener.java:275)
at org.apache.catalina.core.StandardContext.listenerStop(StandardContext.java:3866)
at org.apache.catalina.core.StandardContext.stop(StandardContext.java:4500)
at org.apache.catalina.core.ContainerBase.removeChild(ContainerBase.java:924)
at org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1035)
at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1203)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:293)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1337)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1601)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1590)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.ClassNotFoundException: com.sun.faces.spi.InjectionProviderException
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1358)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
... 14 more
2017-6-1 8:26:43 org.apache.catalina.core.StandardContext listenerStop
严重: Exception sending context destroyed event to listener instance of class com.sun.faces.config.ConfigureListener
java.lang.NoClassDefFoundError: com/sun/faces/config/ConfigureListener$ServletContextAdapter
at com.sun.faces.config.ConfigureListener.contextDestroyed(ConfigureListener.java:489)
at org.apache.catalina.core.StandardContext.listenerStop(StandardContext.java:3866)
at org.apache.catalina.core.StandardContext.stop(StandardContext.java:4500)
at org.apache.catalina.core.ContainerBase.removeChild(ContainerBase.java:924)
at org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1035)
at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1203)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:293)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1337)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1601)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1590)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.ClassNotFoundException: com.sun.faces.config.ConfigureListener$ServletContextAdapter
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1358)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
... 13 more
然后当我再次add deployment的时候，会出现以下：
2017-6-1 8:29:53 org.apache.catalina.startup.ContextConfig defaultWebConfig
信息: No default web.xml
这怎么办啊。。。。。怎么才能恢复原来的配置啊
