Spring cvc-elt.1: Cannot find the declaration of element 'beans'.

<beans xmlns="http://www.springframework.org/schema/beans"
?? ?xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
?? ?xmlns:aop="http://www.springframework.org/schema/aop"
?? ?xmlns:tx="http://www.springframework.org/schema/tx"
?? ?xmlns:context="http://www.springframework.org/schema/context"
?? ?xsi:schemaLocation=" ?
http://www.springframework.org/schema/beans? ?
http://www.springframework.org/schema/beans/spring-beans-2.0.xsd ?
http://www.springframework.org/schema/aop? ?
http://www.springframework.org/schema/aop/spring-aop-2.0.xsd ?
http://www.springframework.org/schema/tx? ?
http://www.springframework.org/schema/tx/spring-tx-2.0.xsd">

这个的格式异常：比如spring-aop-2.0.xsd写成spring-aop.xsd 就会爆出Spring cvc-elt.1: Cannot find the declaration of element 'beans'.