新手自学Struts2 遇到了难题,求大神带飞

运行的时候,报了错误
1.警告: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:listvnkf' did not find a matching property.
2.严重: Exception starting filter struts2
java.lang.ClassNotFoundException: org.apache.struts2.dispatcher.ng
        .filter.StrutsPrepareAndExecuteFilter
严重: One or more Filters failed to start. Full details will be found in the appropriate container log file
八月 17, 2016 3:41:33 下午 org.apache.catalina.core.StandardContext startInternal
严重: Context [/listvnkf] startup failed due to previous errors
八月 17, 2016 3:41:33 下午 org.apache.coyote.AbstractProtocol start
信息: Starting ProtocolHandler ["http-nio-8080"]
八月 17, 2016 3:41:33 下午 org.apache.coyote.AbstractProtocol start
信息: Starting ProtocolHandler ["ajp-nio-8009"]
八月 17, 2016 3:41:33 下午 org.apache.catalina.startup.Catalina start
信息: Server startup in 2001 ms