TilesContainer not initialized

Hi,

I'm trying to implement tiles on my webapp; I followed the tutorial on
the tiles site but I got an  exception.
Any idea to correct it?

The exception:
^^^^^^^^^^^^^^^^^^^^^^^^
May 13, 2008 6:49:34 PM org.apache.tiles.jsp.taglib.RenderTagSupport doCatch
SEVERE: Error during rendering
javax.servlet.jsp.JspException: TilesContainer not initialized
    at
org.apache.tiles.jsp.taglib.ContainerTagSupport.doStartTag(ContainerTagSupport.java:72)
    at
org.apache.tiles.jsp.taglib.RenderTagSupport.doStartTag(RenderTagSupport.java:146)
    at
org.apache.jsp.index_jsp._jspx_meth_tiles_005finsertDefinition_005f0(index_jsp.java:83)
    at org.apache.jsp.index_jsp._jspService(index_jsp.java:56)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331)
    at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
    at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
    at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
    at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433)
    at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
    at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
    at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
    at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:874)
    at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
    at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
    at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
    at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
    at java.lang.Thread.run(Thread.java:595)

 
 
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