Hi everyone, I'm trying to activate U2F as the default authentification mechanism. We've just installed Gluu server, which has not been modified yet. Following these [indications](https://gluu.org/docs/gluu-server/4.0/authn-guide/U2F/) I encounter an error. On enabling the custom script for U2F, the change is accepted, but after a minute, the script appears in Red with the following error: ``` java.lang.Exception: Using default external type class at org.gluu.service.custom.script.CustomScriptManager.createExternalType(CustomScriptManager.java:367) at org.gluu.service.custom.script.CustomScriptManager.reloadCustomScriptConfigurations(CustomScriptManager.java:268) at org.gluu.service.custom.script.CustomScriptManager.reloadImpl(CustomScriptManager.java:157) at org.gluu.service.custom.script.CustomScriptManager.reload(CustomScriptManager.java:144) at org.gluu.service.custom.script.CustomScriptManager.reloadTimerEvent(CustomScriptManager.java:120) at org.gluu.service.custom.script.CustomScriptManager$Proxy$_$$_WeldSubclass.reloadTimerEvent(Unknown Source) at sun.reflect.GeneratedMethodAccessor128.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.jboss.weld.injection.StaticMethodInjectionPoint.invoke(StaticMethodInjectionPoint.java:95) at org.jboss.weld.injection.StaticMethodInjectionPoint.invoke(StaticMethodInjectionPoint.java:85) at org.jboss.weld.injection.MethodInvocationStrategy$SimpleMethodInvocationStrategy.invoke(MethodInvocationStrategy.java:168) at org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:330) at org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:308) at org.jboss.weld.event.ObserverMethodImpl.notify(ObserverMethodImpl.java:286) at javax.enterprise.inject.spi.ObserverMethod.notify(ObserverMethod.java:124) at org.jboss.weld.util.Observers.notify(Observers.java:166) at org.jboss.weld.event.ObserverNotifier.notifySyncObservers(ObserverNotifier.java:285) at org.jboss.weld.event.ObserverNotifier.notify(ObserverNotifier.java:273) at org.jboss.weld.event.ObserverNotifier.fireEvent(ObserverNotifier.java:177) at org.jboss.weld.event.ObserverNotifier.fireEvent(ObserverNotifier.java:159) at org.jboss.weld.manager.BeanManagerImpl.fireEvent(BeanManagerImpl.java:632) at org.jboss.weld.util.ForwardingBeanManager.fireEvent(ForwardingBeanManager.java:104) at org.gluu.service.timer.TimerJob.execute(TimerJob.java:39) at org.gluu.service.timer.JobExecutionDelegate.execute(JobExecutionDelegate.java:31) at org.quartz.core.JobRunShell.run(JobRunShell.java:202) at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573) ==================Further details============================ Using default external type class ``` Is there some option I failed to install? Thanks a lot in advance, Best, nicolas