出现错误,这是怎么回事呢？

严重: Allocate exception for servlet seckill-dispatcher

org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Cannot locate BeanDefinitionDecorator for element [component-scan]

Offending resource: file [F:\Workspace\eclipse\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\seckill\WEB-INF\classes\spring\spring-web.xml]

at org.springframework.beans.factory.parsing.FailFastProblemReporter.fatal(FailFastProblemReporter.java:60)

at org.springframework.beans.factory.parsing.ReaderContext.fatal(ReaderContext.java:68)

at org.springframework.beans.factory.parsing.ReaderContext.fatal(ReaderContext.java:55)

at org.springframework.beans.factory.xml.NamespaceHandlerSupport.findDecoratorForNode(NamespaceHandlerSupport.java:121)

at org.springframework.beans.factory.xml.NamespaceHandlerSupport.decorate(NamespaceHandlerSupport.java:99)

at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.decorateIfRequired(BeanDefinitionParserDelegate.java:1464)

at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.decorateBeanDefinitionIfRequired(BeanDefinitionParserDelegate.java:1451)

at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.decorateBeanDefinitionIfRequired(BeanDefinitionParserDelegate.java:1431)

at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.processBeanDefinition(DefaultBeanDefinitionDocumentReader.java:303)

at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseDefaultElement(DefaultBeanDefinitionDocumentReader.java:192)

at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:171)

at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:144)

at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:100)

at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:510)

at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:392)

at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:336)

at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:304)

at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:181)

at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:217)

at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:188)

at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:125)

at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:94)

at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:129)

at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:537)

at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:452)

at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:664)

at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:630)

at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:678)

at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:549)

at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:490)

at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)

at javax.servlet.GenericServlet.init(GenericServlet.java:158)

at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1238)

at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1151)

spring-web.xml的内容：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd 
        http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!-- 配置springMVC -->
<!-- 1:开启SpringMVC注解模式 -->
<!-- 作用（1）自动注册DefaultAnnotationHandleMapping,AnnotationMethodHandlerAdapter注解 -->
<!-- 作用（2）提供一系列：数据绑定，数字和日期的format(格式化) @NumberFormat,@DataTimeFormat,xml,json默认读写支持 -->
<mvc:annotation-driven />

<!-- 2：静态资源默认servlet配置 -->
<!-- 作用（1）加入对静态资源的处理：js，gif,png -->
<!-- 作用（2）允许使用"/"做整体映射 (servlet-mapping 映射路径：“/”)-->
<mvc:default-servlet-handler />

<!-- 3：配置jsp 显示ViewResolver -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass"  value="org.springframework.web.servlet.view.JstlView"></property>
<property name="prefix"  value="/WEB-INF/jsp"></property>
<property name="suffix"  value=".jsp"></property>

<!-- 4：扫描web相关的bean -->
<context:component-scan base-package="org.seckill.web"/>
</bean>

</beans>