[rules-users] Unable to locate a login configuration

Hi, Please I need your help on this one. I keep getting the following exception on Tomcat (both 6 and 7) when running Guvnor. I can deploy it without problem, but when I hit the URL (http://localhost:8080/drools-guvnor/) the error message is printed on the Tomcat console and a 500 error message ( 500 The call failed on the server; see server log for details) is displayed in the browser. What am I missing in the installation process? Thanks, Klaus. ERROR 10-11 05:02:53,771 (LoggingHelper.java:error:76) Service method 'public abstract org.drools.guvnor.client.rpc.UserSecurityContext org.drools.guvnor.clie nt.rpc.SecurityService.getCurrentUser()' threw an unexpected exception: java.lan g.SecurityException: Unable to locate a login configuration java.lang.SecurityException: Unable to locate a login configuration at com.sun.security.auth.login.ConfigFile.<init>(ConfigFile.java:93) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstruct orAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingC -- GRATIS! Movie-FLAT mit über 300 Videos. Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome