[keycloak-dev] What causes this?

I've screwed something up. I've seen this before, but I can't for the life of me remember what causes it. Look familiar to any of you guys? 09:00:40,332 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-8) MSC000001: Failed to start service jboss.undertow.deployment.default-server.default-host./customer-portal: org.jboss.msc.service.StartException in service jboss.undertow.deployment.default-server.default-host./customer-portal: Failed to start service at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1904) [jboss-msc-1.2.2.Final.jar:1.2.2.Final] at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [rt.jar:1.7.0_51] at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [rt.jar:1.7.0_51] at java.lang.Thread.run(Unknown Source) [rt.jar:1.7.0_51] Caused by: java.lang.RuntimeException: java.lang.RuntimeException: UT010039: Unknown authentication mechanism KEYCLOAK at io.undertow.servlet.core.DeploymentManagerImpl.deploy(DeploymentManagerImpl.java:219) at org.wildfly.extension.undertow.deployment.UndertowDeploymentService.startContext(UndertowDeploymentService.java:87) at org.wildfly.extension.undertow.deployment.UndertowDeploymentService.start(UndertowDeploymentService.java:72) at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1948) [jboss-msc-1.2.2.Final.jar:1.2.2.Final] at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1881) [jboss-msc-1.2.2.Final.jar:1.2.2.Final] ... 3 more Caused by: java.lang.RuntimeException: UT010039: Unknown authentication mechanism KEYCLOAK at io.undertow.servlet.core.DeploymentManagerImpl.setupSecurityHandlers(DeploymentManagerImpl.java:320) at io.undertow.servlet.core.DeploymentManagerImpl.deploy(DeploymentManagerImpl.java:195) ... 7 more