catalina.out tomcat LifecycleException

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Issue

Seeing the following error in catalina.out:

Oct 6, 2010 4:21:24 PM org.apache.catalina.core.ContainerBase addChildInternal
SEVERE: ContainerBase.addChild: start:
LifecycleException:  Error initializaing :  java.lang.NullPointerException

Environment

Red Hat Enterprise Linux 5.5 x86_64
Satellite 5.3
tomcat5-5.5.23-0jpp.9.el5_5.x86_64

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