严重: Error configuring application listener of class com.thinkgem.jeesite.modules.sys.listener.WebContextListener
java.lang.ClassNotFoundException: com.thinkgem.jeesite.modules.sys.listener.WebContextListener
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1892)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1735)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:495)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:477)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:113)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5026)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5633)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:1009)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:985)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:712)
at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:2002)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
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)
求各方大神来帮忙，万分感谢
java.lang.ClassNotFoundException: com.thinkgem.jeesite.modules.sys.listener.WebContextListener
找不到这个类，看看是不是缺少jar包
类没有找到，原因可能：1没有把相关的类或包放webapp中classes或lib 目录下；2com.thinkgem.jeesite.modules.sys.listener.WebContextList与类所在位置不对应，英文不对或类不在英文描述位置