Confusing error on native mobile runtime - Can not write a field name, expecting a value

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Hi everyone,   We are getting a very confusing error on native mobile runtime, When I add a page in with 1 field then the app starts as normal, no problem.   I then add a listview on the form with just a text field in and the app then freezes and gives the following error. com.mendix.systemwideinterfaces.MendixRuntimeException: com.fasterxml.jackson.core.JsonGenerationException: Can not write a field name, expecting a value at com.mendix.util.classloading.Runner.withContextClassLoader(Runner.java:23) Caused by: com.fasterxml.jackson.core.JsonGenerationException: Can not write a field name, expecting a value at com.fasterxml.jackson.core.JsonGenerator._reportError(JsonGenerator.java:2657) at com.fasterxml.jackson.core.json.WriterBasedJsonGenerator.writeFieldName(WriterBasedJsonGenerator.java:150) at com.mendix.webui.jsonserialization.JsonGeneratorWrapper.$anonfun$writeFieldName$1(JsonGeneratorWrapper.scala:38) at com.mendix.webui.jsonserialization.JsonGeneratorWrapper.$anonfun$writeFieldName$1$adapted(JsonGeneratorWrapper.scala:38) at scala.collection.IterableOnceOps.foreach(IterableOnce.scala:563) at scala.collection.IterableOnceOps.foreach$(IterableOnce.scala:561) at scala.collection.AbstractIterable.foreach(Iterable.scala:919) at com.mendix.webui.jsonserialization.JsonGeneratorWrapper.writeFieldName(JsonGeneratorWrapper.scala:38) at com.mendix.webui.jsonserialization.ResultSerializer.$anonfun$generateJsResult$2(ResultSerializer.scala:30) at com.mendix.webui.jsonserialization.ResultSerializer.$anonfun$generateJsResult$2$adapted(ResultSerializer.scala:29) at scala.collection.IterableOnceOps.foreach(IterableOnce.scala:563) at scala.collection.IterableOnceOps.foreach$(IterableOnce.scala:561) at scala.collection.AbstractIterable.foreach(Iterable.scala:919) at scala.collection.IterableOps$WithFilter.foreach(Iterable.scala:889) at com.mendix.webui.jsonserialization.ResultSerializer.generateJsResult(ResultSerializer.scala:29) at com.mendix.webui.requesthandling.ClientRequestHandler.handleAction(ClientRequestHandler.scala:111) at com.mendix.webui.requesthandling.ClientRequestHandler.processRequest(ClientRequestHandler.scala:79) at com.mendix.externalinterface.connector.RequestHandler.doProcessRequest(RequestHandler.java:35) at com.mendix.external.connector.MxRuntimeConnector.lambda$processRequest$0(MxRuntimeConnector.java:74) at com.mendix.util.classloading.Runner.withContextClassLoader(Runner.java:19) at com.mendix.external.connector.MxRuntimeConnector.processRequest(MxRuntimeConnector.java:73) at com.mendix.basis.impl.MxRuntimeImplBase.processRequest(MxRuntimeImplBase.java:838) at com.mendix.m2ee.appcontainer.server.handler.RuntimeServlet.service(RuntimeServlet.scala:25) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:799) at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1626) at org.eclipse.jetty.websocket.server.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:228) at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193) at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1601) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:548) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1624) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1434) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:501) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1594) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1349) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) at org.eclipse.jetty.server.Server.handle(Server.java:516) at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:388) at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:633) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:380) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:277) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105) at org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:338) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:315) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:173) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:131) at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:386) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:883) at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1034) at java.base/java.lang.Thread.run(Thread.java:834) The form looks like this: And this is the list view entity:   I have looked at this question and one of the answers was that it is normally a calculated attribute, but we have none on the entity.   Any help will be appreciated. Thanks.
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