[rules-users] Validate/View Source or new rule (Decision table- web guided editor) - SerializationException - Guvnor 5.1.1

Hi, Till few days ago we use to deploy 5.1.1 war from drools and site and work on it, it use to work perfectly Recently we got guvnor 5.1.1 source code, did maven build locally and started using war after deploying in weblogic. When I try to create rule of type "Decision table- web guided editor" and view source its giving SerializationException exception in UI an in server log it says <Nov 22, 2010 6:03:01 PM IST> <Error> <ServletContext-/drools-guvnor> <BEA-000000> <guvnorService: An IncompatibleRemoteServiceException was thrown while processing this call. com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException: com.google.gwt.user.client.rpc.SerializationException: Invalid type signature for org.drools.ide.common.client.modeldriven.dt.ActionSetFieldCol at com.google.gwt.user.server.rpc.RPC.decodeRequest(RPC.java:308) at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:186) at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:224) at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62) at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) Truncated. see log file for complete stacktrace com.google.gwt.user.client.rpc.SerializationException: com.google.gwt.user.client.rpc.SerializationException: Invalid type signature for org.drools.ide.common.client.modeldriven.dt.ActionSetFieldCol Any idea what is happening here (I know some issue would be with gwt components), any work around needed in source code?. Help would be greatly appreciated. Do we have stable working version of source code releases in 5.1.1 ( I need to use 5.1.1 only as we already have rule agent code working in production which is compatible with 5.1.1 only). Many Thanks in advance. [cid:image001.png@01CB8A6F.EC686A60] Thanks Kumar