急..spring+quartz问题...怎么老是找不到bean

    <bean id="myQuartz" class="test.MyQuartz"></bean>
<!-- 定义目标bean和bean中的方法 -->
    <bean id="jobtask" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
        <property name="targetObject">
            <ref local="myQuartz"/>
        </property>
        <property name="targetMethod">
            <value>work</value>
        </property>
    </bean>
<!-- 定义触发的时间 -->
    <bean id = "cron" class = "org.springframework.scheduling.quartz.CronTriggerBean">
        <property name="jobDetail">
            <ref bean="jobtask"/>
        </property>
        <property name="cronExpression">
            <value>* * 18 * * ?</value>
        </property>
    </bean>
<!-- 总管理 -->
    <bean autowire = "no" class = "org.springframework.scheduling.quartz.SchedulerFactoryBean">
        <property name="triggers">
            <list>
                <ref local ="cron"/>
            </list>
        </property>
    </bean>
</beans>
代码错了吗?怎么我连网上复制的也不行...求救