WebSphere 6.1 Scan tool

I'm using a scanner tool from IBM about the configuration settings in WAS6.1. It is running on AIX 5.3, but when I run it I get an error. The name of the tool is: IBM Security Configuration Scanner for WebSphere Application Server, tool version 1.0

The error occurs when it hits the 3: Certificate Checker, processing key store: NodeDefaultKeyStore:
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:615)
at com.ibm.ws.bootstrap.WSLauncher.main(WSLauncher.java:263)
Caused by: java.lang.NoClassDefFoundError: org.eclipse.emf.ecore.EFactory
at java.lang.ClassLoader.defineClassImpl(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:222)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:148)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:556)
at java.net.URLClassLoader.access$400(URLClassLoader.java:119)
at java.net.URLClassLoader$ClassFinder.run(URLClassLoader.java:961)
at java.security.AccessController.doPrivileged(AccessController.java:274)
at java.net.URLClassLoader.findClass(URLClassLoader.java:487)
at java.lang.ClassLoader.loadClass(ClassLoader.java:604)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:327)
at java.lang.ClassLoader.loadClass(ClassLoader.java:561)
at java.lang.J9VMInternals.verifyImpl(Native Method)
at java.lang.J9VMInternals.verify(J9VMInternals.java:59)
at java.lang.J9VMInternals.verify(J9VMInternals.java:57)
at java.lang.J9VMInternals.initialize(J9VMInternals.java:120)
at org.eclipse.hyades.logging.events.cbe.impl.EventFactoryContext. (EventFactoryContext.java:82)
at org.eclipse.hyades.logging.events.cbe.impl.EventFactoryContext.getInstance(EventFactoryContext.java:122)
at com.ibm.ejs.ras.Tr. (Tr.java:285)
at java.lang.J9VMInternals.initializeImpl(Native Method)
at java.lang.J9VMInternals.initialize(J9VMInternals.java:177)
at com.ibm.ws.security.util.PasswordUtil.(PasswordUtil.java:51)
at java.lang.J9VMInternals.initializeImpl(Native Method)
at java.lang.J9VMInternals.initialize(J9VMInternals.java:177)
at com.ibm.wsst.CertChecker.getDecodedPassword(CertChecker.java:151)
at com.ibm.wsst.CertChecker.provideDummyCertWarnings(CertChecker.java:186)
at com.ibm.wsst.CertChecker.processKeyStores(CertChecker.java:548)
at com.ibm.wsst.CertChecker.configCheckInFile(CertChecker.java:519)
at com.ibm.wsst.CertChecker.configCheck(CertChecker.java:493)
at com.ibm.wsst.CertChecker.configCheck(CertChecker.java:500)
at com.ibm.wsst.CertChecker.checkSecurityConfig(CertChecker.java:474)
at com.ibm.wsst.CertChecker.checkInConfig(CertChecker.java:440)
at com.ibm.wsst.CertChecker.doCheck(CertChecker.java:112)
at com.ibm.wsst.Controller.doEachCheck(Controller.java:264)
at com.ibm.wsst.Controller.prioritizeChecks(Controller.java:231)
at com.ibm.wsst.Controller.runInteractive(Controller.java:161)
at com.ibm.wsst.Controller.main(Controller.java:66)

Does anyone know anything about this error??

Thanks