I have upgraded two apps from v 6.20 to 6.30 and I am trying to do a simple app service call, but for some reason the call fails and I get the following trace. com.mendix.modules.microflowengine.MicroflowException: at UpdateDIMEMessages.IVK_UpdateDIMEMessages (CallWebservice : 'Call web service 'IVK_UpdateDIMEMessages'') at DIME.IVK_Update103Messages (SubMicroflow : 'Call 'IVK_UpdateDIMEMessages'') Advanced stacktrace: at com.mendix.modules.microflowengine.MicroflowUtil.processException(MicroflowUtil.java:143) Caused by: java.lang.NullPointerException: null at com.mendix.integration.xmlexporter.XMLExporter.getChildObjectsByMicroflow(XMLExporter.scala:383) at com.mendix.integration.xmlexporter.XMLExporter.getChildObjects(XMLExporter.scala:374) at com.mendix.integration.xmlexporter.XMLExporter.handleNonEmptyObjectMappingElement(XMLExporter.scala:300) at com.mendix.integration.xmlexporter.XMLExporter.com$mendix$integration$xmlexporter$XMLExporter$$handleObjectMappingElement(XMLExporter.scala:278) at com.mendix.integration.xmlexporter.XMLExporter$$anonfun$handleChildMappingElements$1.apply(XMLExporter.scala:140) at com.mendix.integration.xmlexporter.XMLExporter$$anonfun$handleChildMappingElements$1.apply(XMLExporter.scala:130) at scala.collection.Iterator$class.foreach(Iterator.scala:742) at scala.collection.AbstractIterator.foreach(Iterator.scala:1194) at scala.collection.IterableLike$class.foreach(IterableLike.scala:72) at scala.collection.AbstractIterable.foreach(Iterable.scala:54) at com.mendix.integration.xmlexporter.XMLExporter.handleChildMappingElements(XMLExporter.scala:130) at com.mendix.integration.xmlexporter.XMLExporter.com$mendix$integration$xmlexporter$XMLExporter$$exportMendixObject(XMLExporter.scala:104) at com.mendix.integration.xmlexporter.XMLExporter.com$mendix$integration$xmlexporter$XMLExporter$$exportRootMendixObject(XMLExporter.scala:90) at com.mendix.integration.xmlexporter.XMLExporter$$anonfun$export$1.apply(XMLExporter.scala:65) at com.mendix.integration.xmlexporter.XMLExporter$$anonfun$export$1.apply(XMLExporter.scala:63) at scala.collection.Iterator$class.foreach(Iterator.scala:742) at scala.collection.AbstractIterator.foreach(Iterator.scala:1194) at scala.collection.IterableLike$class.foreach(IterableLike.scala:72) at scala.collection.AbstractIterable.foreach(Iterable.scala:54) at com.mendix.integration.xmlexporter.XMLExporter.export(XMLExporter.scala:63) at com.mendix.integration.webservices.call.messageparts.AdvancedMessageXMLSubpart.render(AdvancedMessageXMLSubpart.scala:37) at com.mendix.integration.webservices.call.messageparts.AdvancedMessagePart$$anonfun$render$1.apply(AdvancedMessagePart.scala:31) at com.mendix.integration.webservices.call.messageparts.AdvancedMessagePart$$anonfun$render$1.apply(AdvancedMessagePart.scala:29) at scala.collection.Iterator$class.foreach(Iterator.scala:742) at scala.collection.AbstractIterator.foreach(Iterator.scala:1194) at scala.collection.IterableLike$class.foreach(IterableLike.scala:72) at scala.collection.AbstractIterable.foreach(Iterable.scala:54) at com.mendix.integration.webservices.call.messageparts.AdvancedMessagePart.render(AdvancedMessagePart.scala:29) at com.mendix.integration.webservices.call.WebserviceCaller.buildSOAPRequestBody(WebserviceCaller.java:539) at com.mendix.integration.webservices.call.WebserviceCaller.call(WebserviceCaller.java:124) at com.mendix.integration.webservices.WebserviceModuleImpl.callWebservice(WebserviceModuleImpl.java:203) at com.mendix.integration.internal.InternalIntegrationImpl.callWebservice(InternalIntegrationImpl.scala:274) at com.mendix.integration.actions.microflow.CallWebServiceAction.execute(CallWebServiceAction.scala:96) 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:32) at com.mendix.core.actionmanagement.ActionManager.executeSync(ActionManager.java:174) at com.mendix.core.component.InternalCore.executeSync(InternalCore.java:459) 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:32) at com.mendix.core.actionmanagement.ActionManager.executeSync(ActionManager.java:174) at com.mendix.core.component.InternalCore.execute(InternalCore.java:377) at com.mendix.webui.actions.client.ExecuteAction.execute(ExecuteAction.java:135) at com.mendix.webui.requesthandling.ClientRequestHandler$$anonfun$handleRequest$1.apply$mcV$sp(ClientRequestHandler.scala:324) at com.mendix.webui.requesthandling.ClientRequestHandler$$anonfun$handleRequest$1.apply(ClientRequestHandler.scala:317) at com.mendix.webui.requesthandling.ClientRequestHandler$$anonfun$handleRequest$1.apply(ClientRequestHandler.scala:317) at com.mendix.core.session.Worker$$anonfun$receive$3$$anonfun$2$$anon$1.execute(ActionDispatching.scala:144) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:32) at com.mendix.core.session.Worker$$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) I understand that this refer to something being empty. I checked all the object that I am passing to the app service and all of them seems to be empty. One interesting thing that happened though, is that while debugging I tried to import the app service definition in a test project version 5.21.1 and when I tried to import the definition I got this error This happend as well when I imported the definition in 6.2.0,after that I trried several to change the app service , export it and re-importing it in 5.21.1 but this message still stays, could it be that there is a correlation between this two issues?