[Building Sakai] Site tool question

[Omer A Piperdi]

We get the following error message in some of the sites while updating 
the users role.. Any pointer for this??

Thanks
Omer

2012-08-22 13:40:45,807  WARN http-bio-8443-exec-10 
org.sakaiproject.authz.impl.BaseAuthzGroup - .addUserRole: role 
undefined: null
2012-08-22 13:40:45,809  WARN http-bio-8443-exec-10 
org.sakaiproject.cheftool.VelocityPortletPaneledAction - Exception 
calling method doUpdate_participant 
java.lang.reflect.InvocationTargetException (Caused by 
java.lang.IllegalArgumentException: addMember called with null role!)
java.lang.reflect.InvocationTargetException
         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
         at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
         at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
         at java.lang.reflect.Method.invoke(Method.java:597)
         at 
org.sakaiproject.cheftool.VelocityPortletPaneledAction.actionDispatch(VelocityPortletPaneledAction.java:749)
         at 
org.sakaiproject.cheftool.VelocityPortletPaneledAction.processAction(VelocityPortletPaneledAction.java:625)
         at 
org.sakaiproject.cheftool.ToolServlet.doGet(ToolServlet.java:230)
         at 
org.sakaiproject.cheftool.VelocityPortletPaneledAction.doGet(VelocityPortletPaneledAction.java:1156)
         at 
org.sakaiproject.cheftool.ToolServlet.doPost(ToolServlet.java:154)
         at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
         at 
org.sakaiproject.vm.ComponentServlet.service(ComponentServlet.java:56)
         at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
         at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
         at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
         at 
org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:598)
         at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
         at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
         at 
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:690)
         at 
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:477)
         at 
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:369)
         at 
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:329)
         at 
org.sakaiproject.tool.impl.ActiveToolComponent$MyActiveTool.forward(ActiveToolComponent.java:511)
         at 
org.sakaiproject.portal.charon.SkinnableCharonPortal.forwardTool(SkinnableCharonPortal.java:1466)
         at 
org.sakaiproject.portal.charon.handlers.ToolHandler.doTool(ToolHandler.java:213)
         at 
org.sakaiproject.portal.charon.handlers.ToolHandler.doGet(ToolHandler.java:96)
         at 
org.sakaiproject.portal.charon.handlers.ToolHandler.doPost(ToolHandler.java:73)
         at 
org.sakaiproject.portal.charon.SkinnableCharonPortal.doPost(SkinnableCharonPortal.java:1259)
         at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
         at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
         at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
         at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
         at 
org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:659)
         at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
         at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
         at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
         at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
         at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
         at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
         at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
         at 
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
         at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
         at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
         at 
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1001)
         at 
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
         at 
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
         at 
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
         at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
         at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.IllegalArgumentException: addMember called with 
null role!
         at 
org.sakaiproject.authz.impl.BaseAuthzGroup.addMember(BaseAuthzGroup.java:1024)
         at 
org.sakaiproject.site.tool.SiteAction.doUpdate_participant(SiteAction.java:6825)
         ... 48 more