一启动tomcat就报错：
严重: Exception starting filter struts2
Unable to load configuration. - bean - jar:file:/D:/javaSoftware/tomcat6.0/webapps/extjsdev/WEB-INF/lib/struts2-core-2.1.8.jar!/struts-default.xml:47:178
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:431)
at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:69)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:51)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:275)
at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:397)
at org.apache.catalina.core.ApplicationFilterConfig.(ApplicationFilterConfig.java:108)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3800)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4450)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:526)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:987)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:909)
网上找了半天也不知道什么原因，大部分说包不对，但是都换成是Struts2 2.1.8.jar了，还是一样的错误
恳求各位大哥指点指点.........
struts2导入的包如下：
freemarker-2.3.15.jar
ognl-2.7.3.jar
struts2-core-2.1.8.jar
struts2-spring-plugin-2.1.8.jar
xwork-core-2.1.6.jar
web。xml配置：
struts2
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
struts2
/*
