Hi, I'm trying to delete a user during a new user registration process if the previous account was not confirmed. And I decided to use Admin REST API with keycloak-admin-client, but, when using, the following exception is thrown: 16:59:56,028 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-3) MSC000001: Failed to start service jboss.deployment.unit."keycloak-sms-authenticator-fat-1.1.0.jar".POST_MODULE: org.jboss.msc.service.StartException in service jboss.deployment.unit."keycloak-sms-authenticator-fat-1.1.0.jar".POST_MODULE: WFLYSRV0153: Failed to process phase POST_MODULE of deployment "keycloak-sms-authenticator-fat-1.1.0.jar" at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:151) at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1738) at org.jboss.msc.service.ServiceControllerImpl$StartTask.execute(ServiceControllerImpl.java:1700) at org.jboss.msc.service.ServiceControllerImpl$ControllerTask.run(ServiceControllerImpl.java:1558) at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35) at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1985) at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1487) at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1378) at java.lang.Thread.run(Thread.java:748) Caused by: java.lang.IllegalArgumentException: interface org.keycloak.admin.client.token.TokenService is not visible from class loader at java.lang.reflect.Proxy$ProxyClassFactory.apply(Proxy.java:581) at java.lang.reflect.Proxy$ProxyClassFactory.apply(Proxy.java:557) at java.lang.reflect.WeakCache$Factory.get(WeakCache.java:230) at java.lang.reflect.WeakCache.get(WeakCache.java:127) at java.lang.reflect.Proxy.getProxyClass0(Proxy.java:419) at java.lang.reflect.Proxy.newProxyInstance(Proxy.java:719) at org.jboss.resteasy.client.jaxrs.ProxyBuilder.proxy(ProxyBuilder.java:85) at org.jboss.resteasy.client.jaxrs.ProxyBuilder.build(ProxyBuilder.java:152) at org.jboss.resteasy.client.jaxrs.internal.ClientWebTarget.proxy(ClientWebTarget.java:93) at org.keycloak.admin.client.token.TokenManager.<init>(TokenManager.java:55) at org.keycloak.admin.client.Keycloak.<init>(Keycloak.java:59) at org.keycloak.admin.client.Keycloak.getInstance(Keycloak.java:87) at org.keycloak.admin.client.Keycloak.getInstance(Keycloak.java:103) at my.plugin.postInit(plugin.java:line) at org.keycloak.services.DefaultKeycloakSessionFactory.deploy(DefaultKeycloakSessionFactory.java:138) at org.keycloak.provider.ProviderManagerRegistry.deploy(ProviderManagerRegistry.java:42) at org.keycloak.subsystem.server.extension.KeycloakProviderDeploymentProcessor.deploy(KeycloakProviderDeploymentProcessor.java:55) at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:144) ... 8 How this error can be fixed? Best wishes, Pavel