fortress:why is this exception?

[Mu Mike]

I have this block of code: 

  final FortressConfig config = new FortressConfig(); 
  config.setContextDirectory(""); 
  config.setWorkDirectory(""); 
  config.setContainerConfiguration("systemTRY.xconf"); 
  config.setRoleManagerConfiguration("reportTRY.roles"); 
//    config.setLoggerManagerConfiguration("logkit.xconf"); 

  ContainerManager cm = new 
            DefaultContainerManager(config.getContext()); 
     ContainerUtil.initialize( cm ); 

  DefaultContainer container = (DefaultContainer) cm.getContainer(); 
  ServiceManager manager = container.getServiceManager(); 

//    ServiceSelector selector = (ServiceSelector) 
manager.lookup(Runner.ROLE+"Selector"); 
//    Runner service=(Runner)selector.select("Runner.Another"); 

  Runner service=(Runner)manager.lookup(Runner.ROLE); 
  System.out.println(service.getName()); 
  container.getServiceManager().release(service); 
  org.apache.avalon.framework.container.ContainerUtil.dispose( cm ); 

reportTRY.roles 

<?xml version="1.0"?> 
<role-list> 
<role name="Runner"> 
  <component shorthand="Runner" class="DefaultRunner"/> 
</role> 
</role-list> 

systemTRY.xconf 

<my-system> 
<Runner id="Runner" name="I M DEFAULT RUNNER"/> 
</my-system> 

when I ran this code, it could lookup the service well,but when I debug 
this code to this statement    

ContainerManager cm = new 
            DefaultContainerManager(config.getContext()); 

and once I stepped this statement, it kept throwing the following 
exception: 

java.lang.AbstractMethodError: 
org/apache/excalibur/event/impl/AbstractQueue.enqueue 
at 
org.apache.excalibur.event.command.AbstractThreadManager$PipelineRunner.run(AbstractThreadManager.java:310) 

at 
EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:727) 

at java.lang.Thread.run(Thread.java:484) 

why is this? 

Thanks 
Mike

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