求教！！！！我启动tomcat 报这样的错误怎么解决？

严重: Error configuring application listener of class com.lietener.servletContextListener
java.lang.ClassNotFoundException: com.lietener.servletContextListener
 at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1858)
 at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1701)
 at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:504)
 at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:486)
 at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:113)
 at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4984)
 at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5584)
 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
 at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1572)
 at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1562)
 at java.util.concurrent.FutureTask.run(FutureTask.java:266)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
 at java.lang.Thread.run(Thread.java:745)