$Proxy6 cannot be cast to

<bean id="transactionProxy"
		class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
		<property name="transactionManager">
			<ref bean="transactionManager" />
		</property>
		<property name="transactionAttributes">
			<props>
				<prop key="*">PROPAGATION_REQUIRED</prop>
			</props>
		</property>
		<property name="target">
			<bean
				class="com.spring.ch11.dao.hibernate.demohibernatedao.TestDao">
				<property name="sessionFactory" ref="sessionFactory" />
			</bean>
		</property>
		<property name="proxyTargetClass">
			<value>true</value>
		</property>
	</bean>