Problema com o placeholder no Spring

Olá a todos, meu Tomcat está gerando um erro:

The matching wildcard is strict, but no declaration can be found for element ‘context:property-placeholder’

olhem o meu aplicationContext:

<?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:context="http://www.springframework.org/schema/context"
    xmlns:jee="http://www.springframework.org/schema/jee"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="
            http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-25.xsd
            http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-2.5.xsd
            http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">

    <!--
        //////////////////////////////////////
        Integracao do Spring com o Hibernate
        //////////////////////////////////////
    --> 

    <!--
        Carregamento do Arquivo de Configuracoes do JDBC
    -->
    NA LINHA ABAIXO ELE ACUSA O ERRO
    <context:property-placeholder location="classpath:jdbc.properties"/> 

    <!--
        Configuracao do DataSource
    -->

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName">
            <value>${jdbc.driverClassName}</value>
        </property>

        <property name="url">
            <value>${jdbc.url}</value>
        </property>

        <property name="username">
            <value>${jdbc.username}</value>
        </property>

        <property name="password">
            <value>${jdbc.password}</value>
        </property>
    </bean> 


    <!--
        Hibernate SessionFactory
    -->

    <bean id="sessionFactory"  class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> 
        <property name="dataSource">
            <ref local="dataSource" />
        </property> 


        <!-- Carrega todos os HBM's -->
        <property name="mappingDirectoryLocations">
            <list>
                <value>
                    classpath:model/repository/
                </value>
            </list>
        </property>

 
        <!-- Configuracoes do Hibernate -->
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">
                    org.hibernate.dialect.PostgreSQLDialect
                </prop>

                <prop key="hibernate.show_sql">true</prop>

                <!--
                    Atualizar o Banco de dados de acordo com os arquivos de mapeamentos.
                    <prop key="hibernate.hbm2ddl.auto">update</prop>
                -->
            </props>
        </property>

        <property name="eventListeners">
            <map>
                <entry key="merge">
                    <bean class="org.springframework.orm.hibernate3.support.IdTransferringMergeEventListener" />
                </entry>
            </map>
        </property>
    </bean>

 

    <!--
        Transaction Manager
    -->

    <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory">
            <ref local="sessionFactory" />
        </property>
    </bean> 

    <!-- Habilita os Services para serem transicionais via a Annotation @Transactional -->
    <tx:annotation-driven transaction-manager="transactionManager" /> 

    <!-- ============================== AOP DEFINITIONS ================================ -->

    <!-- ========================= BUSINESS OBJECT DEFINITIONS ========================= -->

    <!--
        Activates various annotations to be detected in bean classes:
        Spring's @Required and @Autowired, as well as JSR 250's @Resource.
    -->

    <context:annotation-config /> 

    <!-- Carrega os Beans de Servico -->
    <context:component-scan base-package="model.service" />
 

    <!-- Carrega os Beans DAO Hibernate -->
    <context:component-scan base-package="model.repository" />
</beans>

O que pode ser? O que quer dizer esse erro de placeholder?

Obrigado.