用drw框架时出错，怎么解决啊？？急急急急急急急！！！！！
用drw框架做验证时，在运行首页面的时候，网页出现错误，出现以下异常：

严重: Allocate exception for servlet dwr-invoker
java.lang.NoClassDefFoundError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at org.directwebremoting.impl.ContainerUtil.class$(ContainerUtil.java:97)
at org.directwebremoting.impl.ContainerUtil.setupDefaults(ContainerUtil.java:150)
at org.directwebremoting.impl.ContainerUtil.setupDefaultContainer(ContainerUtil.java:125)
at org.directwebremoting.servlet.DwrServlet.init(DwrServlet.java:73)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1161)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:806)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:133)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:212)
at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:867)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:706)
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1487)
at java.lang.Thread.run(Unknown Source)

怎么解决啊？？？？？？


------解决方案--------------------
配置的了路径不对，系统找不到相应包的定义
------解决方案--------------------
配置的路径不对吧，加载的时候找不到包中相关的CLASS定义文件