The prefix "TX" for Element "Tx:annotation-driven" are not bound

Description of the error: Today, when framing, the configuration enabled transaction annotation has the following error: the prefix "TX" for Element "Tx:annotation-driven" are not bound

Workaround: This is AOP (what is AOP.) See my understanding of AOP http://blog.csdn.net/lizhengnanhua/article/details/8707639) undeclared error, modify the header statement in Applicationcontext.xml as follows: <?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:p= "http://www.springframework.org/schema/p"
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-3.0.xsd
Http://www.springframework.org/schema/tx
Http://www.springframework.org/schema/tx/spring-tx.xsd
Http://www.springframework.org/schema/aop
Http://www.springframework.org/schema/aop/spring-aop.xsd
Http://www.springframework.org/schema/context
Http://www.springframework.org/schema/context/spring-context-2.5.xsd ">

</beans>