After checking some logs I encounter the error below. Not all token replace goes wrong, only a certain type. Anybody a guess what might go wrong here? Regards, Ronald [EDIT] It is part of the Emailtemplate module from the appstore. The Java in that module uses the tokenreplace function of the model reflection. We use the Java function all over our application but only on one point it is throwing this error. [EDIT2] I found the problem. This happens when I have a tokenlist of for instance three but I am only using two tokens in my template. After adjusting the problem was gone. scala.collection.convert.Wrappers$MutableBufferWrapper cannot be cast to com.mendix.systemwideinterfaces.core.IMendixIdentifier -------- java.lang.ClassCastException: scala.collection.convert.Wrappers$MutableBufferWrapper cannot be cast to com.mendix.systemwideinterfaces.core.IMendixIdentifier at mxmodelreflection.TokenReplacer.replaceToken(TokenReplacer.java:114) at mxmodelreflection.TokenReplacer.replaceTokens(TokenReplacer.java:57) at basis.actions.ReplceNotificationTokens_Subject.executeAction(ReplceNotificationTokens_Subject.java:44) at basis.actions.ReplceNotificationTokens_Subject.executeAction(ReplceNotificationTokens_Subject.java:17) at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:49) at com.mendix.core.actionmanagement.CoreAction.doCall(CoreAction.java:260) at com.mendix.core.actionmanagement.CoreAction.call(CoreAction.java:248) at com.mendix.core.actionmanagement.ActionManager$1.execute(ActionManager.java:168) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:36) at com.mendix.core.actionmanagement.ActionManager.executeSync(ActionManager.java:172) at com.mendix.core.component.InternalCore.execute(InternalCore.java:487) at com.mendix.modules.microflowengine.actions.actioncall.JavaAction.execute(JavaAction.scala:52) at com.mendix.modules.microflowengine.microflow.impl.MicroflowObject.execute(MicroflowObject.java:47) at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAfterBreakingIfNecessary(MicroflowImpl.java:192) at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAction(MicroflowImpl.java:149) at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:49) at com.mendix.core.actionmanagement.CoreAction.doCall(CoreAction.java:260) at com.mendix.core.actionmanagement.CoreAction.call(CoreAction.java:248) at com.mendix.core.actionmanagement.ActionManager$1.execute(ActionManager.java:168) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:36) at com.mendix.core.actionmanagement.ActionManager.executeSync(ActionManager.java:172) at com.mendix.core.component.InternalCore.executeSync(InternalCore.java:569) at com.mendix.modules.microflowengine.actions.SubMicroflowAction.execute(SubMicroflowAction.scala:43) at com.mendix.modules.microflowengine.microflow.impl.MicroflowObject.execute(MicroflowObject.java:47) at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAfterBreakingIfNecessary(MicroflowImpl.java:192) at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAction(MicroflowImpl.java:149) at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:49) at com.mendix.core.actionmanagement.CoreAction.doCall(CoreAction.java:260) at com.mendix.core.actionmanagement.CoreAction.call(CoreAction.java:248) at com.mendix.core.actionmanagement.ActionManager$1.execute(ActionManager.java:168) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:36) at com.mendix.core.actionmanagement.ActionManager.executeSync(ActionManager.java:172) at com.mendix.core.component.InternalCore.executeSync(InternalCore.java:569) at com.mendix.modules.microflowengine.actions.other.NestedLoopedMicroflowAction$$anonfun$executeLoop$2.apply(NestedLoopMicroflowAction.scala:67) at com.mendix.modules.microflowengine.actions.other.NestedLoopedMicroflowAction$$anonfun$executeLoop$2.apply(NestedLoopMicroflowAction.scala:58) at scala.collection.TraversableLike$WithFilter$$anonfun$foreach$1.apply(TraversableLike.scala:778) at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59) at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:48) at scala.collection.TraversableLike$WithFilter.foreach(TraversableLike.scala:777) at com.mendix.modules.microflowengine.actions.other.NestedLoopedMicroflowAction.executeLoop(NestedLoopMicroflowAction.scala:58) at com.mendix.modules.microflowengine.actions.other.NestedLoopedMicroflowAction.execute(NestedLoopMicroflowAction.scala:41) at com.mendix.modules.microflowengine.microflow.impl.MicroflowObject.execute(MicroflowObject.java:47) at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAfterBreakingIfNecessary(MicroflowImpl.java:192) at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAction(MicroflowImpl.java:149) at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:49) at com.mendix.core.actionmanagement.CoreAction.doCall(CoreAction.java:260) at com.mendix.core.actionmanagement.CoreAction.call(CoreAction.java:248) at com.mendix.core.actionmanagement.ActionManager$1.execute(ActionManager.java:168) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:36) at com.mendix.core.actionmanagement.ActionManager.executeSync(ActionManager.java:172) at com.mendix.core.component.InternalCore.execute(InternalCore.java:487) at com.mendix.webui.actions.client.ExecuteAction.execute(ExecuteAction.java:144) at com.mendix.webui.requesthandling.ClientRequestHandler$$anonfun$handleRequest$1.apply$mcV$sp(ClientRequestHandler.scala:312) at com.mendix.webui.requesthandling.ClientRequestHandler$$anonfun$handleRequest$1.apply(ClientRequestHandler.scala:302) at com.mendix.webui.requesthandling.ClientRequestHandler$$anonfun$handleRequest$1.apply(ClientRequestHandler.scala:302) at com.mendix.core.session.Worker$$anonfun$receive$3$$anonfun$2$$anon$1.execute(ActionDispatching.scala:144) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:36) at com.mendix.core.session.Worker$$anonfun$receive$3$$anonfun$2.apply(ActionDispatching.scala:146) at scala.util.Try$.apply(Try.scala:192) at com.mendix.core.session.Worker$$anonfun$receive$3.applyOrElse(ActionDispatching.scala:140) at akka.actor.Actor$class.aroundReceive(Actor.scala:465) at com.mendix.core.session.Worker.aroundReceive(ActionDispatching.scala:136) 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)