在学习t5和spring-security时，运行老是出现以下错误：

26-03-2009 16:00:33:483 0    INFO  org.springframework.web.context.ContextLoader  - Root WebApplicationContext: initialization started
26-03-2009 16:00:33:624 141  INFO  org.springframework.web.context.support.XmlWebApplicationContext  - Refreshing org.springframework.web.context.support.XmlWebApplicationContext@67064: display name [Root WebApplicationContext]; startup date [Thu Mar 26 16:00:33 CST 2009]; root of context hierarchy
26-03-2009 16:00:33:889 406  INFO  org.springframework.beans.factory.xml.XmlBeanDefinitionReader  - Loading XML bean definitions from ServletContext resource [/WEB-INF/ApplicationContext-security.xml]
2009-3-26 16:00:34 org.apache.catalina.core.StandardContext listenerStart
严重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from ServletContext resource [/WEB-INF/ApplicationContext-security.xml]; nested exception is java.lang.NoClassDefFoundError: org/aspectj/lang/Signature
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:420)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:342)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:310)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:143)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:178)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:149)
at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:124)
at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:92)
at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:123)
at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:422)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:352)
at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:255)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:199)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:45)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3843)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4342)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:516)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:578)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
Caused by: java.lang.NoClassDefFoundError: org/aspectj/lang/Signature
at org.springframework.security.config.GlobalMethodSecurityBeanDefinitionParser.parse(GlobalMethodSecurityBeanDefinitionParser.java:58)
at org.springframework.beans.factory.xml.NamespaceHandlerSupport.parse(NamespaceHandlerSupport.java:69)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1297)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1287)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:135)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:92)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:507)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:398)
... 28 more
Caused by: java.lang.ClassNotFoundException: org.aspectj.lang.Signature
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1387)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1233)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
... 36 more



我的spring-security.xml如下：
<beans:beans xmlns="http://www.springframework.org/schema/security"
    xmlns:beans="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
                        http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security-2.0.xsd">

    <global-method-security secured-annotations="enabled">
        <!-- AspectJ pointcut expression that locates our "post" method and applies security that way
        <protect-pointcut expression="execution(* bigbank.*Service.post*(..))" access="ROLE_TELLER"/>
        -->
    </global-method-security>

    <http auto-config="true">
        <!-- Restrict URLs based on role -->
<intercept-url pattern="/Login.tml" access="IS_AUTHENTICATED_ANONYMOUSLY"/>
<intercept-url pattern="/LogoutSuccess.tml" access="IS_AUTHENTICATED_ANONYMOUSLY"/>
<intercept-url pattern="/**" access="ROLE_USER"/>
<!-- Override default login and logout pages -->
<form-login login-page="/Login.tml"
login-processing-url="/j_spring_security_check"
default-target-url="/LoginSuccess.tml"
authentication-failure-url="/Login.tml?login_error=1"/>
<logout logout-url="/Logout.tml" logout-success-url="/LogoutSuccess.tml"/>
        <!-- Disable web URI authorization, as we're using <global-method-security> and have @Secured the services layer instead
        <intercept-url pattern="/listAccounts.html" access="IS_AUTHENTICATED_REMEMBERED" />
        <intercept-url pattern="/post.html" access="ROLE_TELLER" />
        -->
        <remember-me />
<!--
    Uncomment to enable X509 client authentication support
        <x509 />
-->

<!-- All of this is unnecessary if auto-config="true"
        <form-login />
        <anonymous />
        <http-basic />
        <logout />
-->

        <!-- Uncomment to limit the number of sessions a user can have
        <concurrent-session-control max-sessions="1" exception-if-maximum-exceeded="true"/>
        -->
    </http>

    <!--
    Usernames/Passwords are
        rod/koala
        dianne/emu
        scott/wombat
        peter/opal
    -->
<authentication-provider>
        <password-encoder hash="md5"/>
        <user-service>
            <user name="david" password="369389d19e24204b4927e30dd7c39efc" authorities="ROLE_USER,ROLE_ADMIN"/>
<user name="alex" password="847c6f184197dc1545d9891d42814a7d" authorities="ROLE_USER"/>
<user name="tim" password="0513111ff330e25c631b5d3e9c0a4aae" authorities="ROLE_USER"/>
        </user-service>
    </authentication-provider>

</beans:beans>

搞不清楚什么原因请教各位大哥啊！

这个提示的很清楚了，加载不了类，你看那个包加进来了没有。