[rules-users] Guvnor deployment problem on websphere 6.1

[arup]

Getting this errors when I'm trying to hit the link 
"http://localhost:9080/drools-guvnor/index.jsp"
How to solve this???
Deployed guvnor 5.2 on WAS 6.1. 

[1/24/12 16:15:00:744 IST] 00000025 ServiceLogger I
com.ibm.ws.ffdc.IncidentStreamImpl open FFDC0009I: FFDC opened incident
stream file C:\Program
Files\IBM\SDP\runtimes\base_v61\profiles\was61profile1\logs\ffdc\server1_00000025_12.01.24_16.15.00_0.txt
[1/24/12 16:15:00:744 IST] 00000025 ServiceLogger I
com.ibm.ws.ffdc.IncidentStreamImpl resetIncidentStream FFDC0010I: FFDC
closed incident stream file C:\Program
Files\IBM\SDP\runtimes\base_v61\profiles\was61profile1\logs\ffdc\server1_00000025_12.01.24_16.15.00_0.txt
[1/24/12 16:15:06:073 IST] 00000025 ServletWrappe I   SRVE0242I:
[drools-guvnor_war] [/drools-guvnor] [/index.jsp]: Initialization
successful.
[1/24/12 16:15:06:108 IST] 00000025 WebApp        E   [Servlet
Error]-[/index.jsp]: java.lang.NoClassDefFoundError:
javassist.util.proxy.MethodHandler
	at java.lang.J9VMInternals.verifyImpl(Native Method)
	at java.lang.J9VMInternals.verify(J9VMInternals.java:68)
	at java.lang.J9VMInternals.initialize(J9VMInternals.java:129)
	at org.jboss.seam.web.ServletContexts.instance(ServletContexts.java:42)
	at
org.jboss.seam.servlet.ContextualHttpServletRequest.run(ContextualHttpServletRequest.java:39)
	at org.jboss.seam.web.ContextFilter.doFilter(ContextFilter.java:37)
	at
com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:190)
	at
com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:130)
	at
com.ibm.ws.webcontainer.filter.WebAppFilterChain._doFilter(WebAppFilterChain.java:87)
	at
com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:832)
	at
com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:679)
	at
com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:565)
	at
com.ibm.ws.wswebcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:478)
	at
com.ibm.wsspi.webcontainer.servlet.GenericServletWrapper.handleRequest(GenericServletWrapper.java:122)
	at
com.ibm.ws.jsp.webcontainerext.AbstractJSPExtensionServletWrapper.handleRequest(AbstractJSPExtensionServletWrapper.java:226)
	at
com.ibm.ws.jsp.webcontainerext.AbstractJSPExtensionProcessor.handleRequest(AbstractJSPExtensionProcessor.java:285)
	at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:3440)
	at com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:267)
	at
com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:815)
	at
com.ibm.ws.wswebcontainer.WebContainer.handleRequest(WebContainer.java:1461)
	at
com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:118)
	at
com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:458)
	at
com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:387)
	at
com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:267)
	at
com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214)
	at
com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113)
	at
com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
	at
com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
	at
com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
	at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:136)
	at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:195)
	at
com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:743)
	at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:873)
	at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1473)
Caused by: java.lang.ClassNotFoundException:
javassist.util.proxy.MethodHandler
	at java.net.URLClassLoader.findClass(URLClassLoader.java:496)
	at com.ibm.ws.bootstrap.ExtClassLoader.findClass(ExtClassLoader.java:132)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:631)
	at com.ibm.ws.bootstrap.ExtClassLoader.loadClass(ExtClassLoader.java:87)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:597)
	... 34 more

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