<exception name="java.lang.NullPointerException" using Spring version 2.5.5

exception name="java.lang.NullPointerException" message="" sequence="0" guid="sfvhco5g:gxcbigxz:00000000:00006089">
<source class="org.springframework.aop.framework.autoproxy .AbstractAutoProxyCreator" archive="spring-aop-2.5.5.jar" vendor="" version="2.5.5" />
<stackTrace>
at org.springframework.aop.framework.autoproxy.Abstra ctAutoProxyCreator.getCacheKey(AbstractAutoProxyCr eator.java:337)
at org.springframework.aop.framework.autoproxy.Abstra ctAutoProxyCreator.predictBeanType(AbstractAutoPro xyCreator.java:260)
at org.springframework.beans.factory.support.Abstract AutowireCapableBeanFactory.predictBeanType(Abstrac tAutowireCapableBeanFactory.java:523)
at org.springframework.beans.factory.support.DefaultL istableBeanFactory.getBeanNamesForType(DefaultList ableBeanFactory.java:222)
at org.springframework.beans.factory.support.DefaultL istableBeanFactory.getBeansOfType(DefaultListableB eanFactory.java:304)
at org.springframework.context.support.AbstractApplic ationContext.getBeansOfType(AbstractApplicationCon text.java:948)
at org.springframework.context.support.AbstractApplic ationContext.registerListeners(AbstractApplication Context.java:702)
at org.springframework.context.support.AbstractApplic ationContext.refresh(AbstractApplicationContext.ja va:378)
at org.springframework.context.support.ClassPathXmlAp plicationContext.&lt;init&gt;(ClassPathXmlApplicat ionContext.java:139)
at org.springframework.context.support.ClassPathXmlAp plicationContext.&lt;init&gt;(ClassPathXmlApplicat ionContext.java:93)
at java.lang.J9VMInternals.initializeImpl(Native Method)
at java.lang.J9VMInternals.initialize(J9VMInternals.j ava:196)
</stackTrace>
</exception>
</entry>

I am using

<spring.version>2.5.5</spring.version>
db2jcc.version>3.61.107</db2jcc.version>
<pdq.version>2.25.89</pdq.version>

Can someone let me know why I am getting this exception trying to launch the app?