We are trying to upgrade from mendix 3.3.7 to Mendix 5.10. We have upgraded the modeler to 4 and then to 5.10. Our uat environment is now upgraded but when starting our application and trying to log in we get the following error: See below Any ideas? com.mendix.core.CoreRuntimeException: com.mendix.systemwideinterfaces.MendixRuntimeException: com.mendix.core.CoreRuntimeException: Exception occurred in action '{"after":[],"before":[],"action":{"type":"LoginAction","user":"mxadmin"},"type":"EventExtendedAction"}', all database changes executed by this action were rolled back at com.mendix.core.actionmanagement.ActionManager.executeSync(ActionManager.java:217) Caused by: com.mendix.systemwideinterfaces.MendixRuntimeException: com.mendix.core.CoreRuntimeException: Exception occurred in action '{"after":[],"before":[],"action":{"type":"LoginAction","user":"mxadmin"},"type":"EventExtendedAction"}', all database changes executed by this action were rolled back at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:43) Caused by: com.mendix.core.CoreRuntimeException: Exception occurred in action '{"after":[],"before":[],"action":{"type":"LoginAction","user":"mxadmin"},"type":"EventExtendedAction"}', all database changes executed by this action were rolled back at com.mendix.core.actionmanagement.CoreAction.processErrorState(CoreAction.java:343) Caused by: java.util.NoSuchElementException: key not found: truldap.ldap_loginaction at scala.collection.MapLike$class.default(MapLike.scala:228) at scala.collection.AbstractMap.default(Map.scala:59) at scala.collection.mutable.HashMap.apply(HashMap.scala:65) at com.mendix.core.actionmanagement.ActionRegistry.getUserActionClass(ActionRegistry.scala:30) at com.mendix.core.action.ActionFactory.createJavaAction(ActionFactory.scala:25) at com.mendix.core.actionmanagement.ActionListener.getReplaceAction(ActionListener.java:120) at com.mendix.core.actionmanagement.EventExtendedAction.checkListeners(EventExtendedAction.java:113) at com.mendix.core.actionmanagement.EventExtendedAction.execute(EventExtendedAction.java:90) at com.mendix.core.actionmanagement.CoreAction.doCall(CoreAction.java:291) at com.mendix.core.actionmanagement.CoreAction.call(CoreAction.java:276) at com.mendix.core.actionmanagement.CustomActionMonitorImpl$$anonfun$run$1.apply(CustomMonitoredAction.scala:17) at com.mendix.core.session.Worker$$anonfun$receive$3$$anonfun$2$$anon$1.execute(ActionDispatching.scala:158) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:37) at com.mendix.core.session.Worker$$anonfun$receive$3$$anonfun$2.apply(ActionDispatching.scala:160) at scala.util.Try$.apply(Try.scala:191) at com.mendix.core.session.Worker$$anonfun$receive$3.applyOrElse(ActionDispatching.scala:154) at akka.actor.Actor$class.aroundReceive(Actor.scala:465) at com.mendix.core.session.Worker.aroundReceive(ActionDispatching.scala:147) at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516) at akka.actor.ActorCell.invoke(ActorCell.scala:487) at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:238) at akka.dispatch.Mailbox.run(Mailbox.scala:220) at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:393) at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260) at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339) at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979) at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)