加载自己做的spring新接口时报的异常，大家帮忙看下这是什么异常？怎么解决？
INFO [org.springframework.beans.factory.xml.XmlBeanDefinitionReader] - Loading XML bean definitions from file [d:\installed\Tomcat 5.5\webapps\DSMP\WEB-INF\dsmp_dao.xml]
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected 

exception parsing XML document from file [d:\installed\Tomcat 5.5\webapps\DSMP\WEB-INF\dsmp_dao.xml]; nested exception is java.lang.IllegalArgumentException: Class 

[org.springframework.beans.factory.xml.SimplePropertyNamespaceHandler] does not implement the NamespaceHandler interface
Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from file [d:\installed\Tomcat 5.5\webapps\DSMP\WEB-

INF\dsmp_dao.xml]; nested exception is java.lang.IllegalArgumentException: Class [org.springframework.beans.factory.xml.SimplePropertyNamespaceHandler] does not implement the 

NamespaceHandler interface
Caused by: java.lang.IllegalArgumentException: Class [org.springframework.beans.factory.xml.SimplePropertyNamespaceHandler] does not implement the NamespaceHandler interface
at org.springframework.beans.factory.xml.DefaultNamespaceHandlerResolver.initHandlerMappings(DefaultNamespaceHandlerResolver.java:119)
at org.springframework.beans.factory.xml.DefaultNamespaceHandlerResolver.<init>(DefaultNamespaceHandlerResolver.java:96)
at org.springframework.beans.factory.xml.DefaultNamespaceHandlerResolver.<init>(DefaultNamespaceHandlerResolver.java:82)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.createDefaultNamespaceHandlerResolver(XmlBeanDefinitionReader.java:530)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.createReaderContext(XmlBeanDefinitionReader.java:519)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:499)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:407)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:357)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:334)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:126)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:142)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:168)
at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:113)
at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:79)
at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:94)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:294)
at org.springframework.context.support.FileSystemXmlApplicationContext.<init>(FileSystemXmlApplicationContext.java:89)
at org.springframework.context.support.FileSystemXmlApplicationContext.<init>(FileSystemXmlApplicationContext.java:74)
at org.springframework.context.support.FileSystemXmlApplicationContext.<init>(FileSystemXmlApplicationContext.java:65)
at com.roadinfo.dao.DaoManagerBean.<init>(DaoManagerBean.java:62)
at com.roadinfo.dao.DaoManagerBean.getDaoManagerBeanForDianxin(DaoManagerBean.java:38)
at com.jxcd.util.Function.<init>(Function.java:31)
at com.jxcd.telecomWeb.LoginUserController.handleRequestInternal(LoginUserController.java:51)