# Error during serialization for property **URL:** \ **Category:** General Discussion\ **Created:** [October 19, 2026, 12:52am UTC](https://forum.inductiveautomation.com/t/error-during-serialization-for-property/117522 "2026-10-19T00:52:30Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Gilberto\_Santos](https://avatars.discourse-cdn.com/v4/letter/g/bc79bd/32.png) [@Gilberto\_Santos](https://forum.inductiveautomation.com/u/Gilberto_Santos)\ **Post date:** [October 19, 2026, 12:52am UTC](https://forum.inductiveautomation.com/t/error-during-serialization-for-property/117522/1 "2026-10-19T00:52:30Z")
![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/0/a/0ab0be1576a6c6c2cc2eb48482cdcdaa8749d04e.png) ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/3/1/314f75228f3d529ba1f95c06ca01361c53108dfa.png) ---
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [October 19, 2026, 1:11am UTC](https://forum.inductiveautomation.com/t/error-during-serialization-for-property/117522/2 "2026-10-19T01:11:08Z")
The screen-shot of the error clips important information. Use the "copy" link in the lower right to get the traceback in text form. Paste it here as "preformatted text". ---
**Author:** ![Gilberto\_Santos](https://avatars.discourse-cdn.com/v4/letter/g/bc79bd/32.png) [@Gilberto\_Santos](https://forum.inductiveautomation.com/u/Gilberto_Santos)\ **Post date:** [October 19, 2026, 12:14pm UTC](https://forum.inductiveautomation.com/t/error-during-serialization-for-property/117522/3 "2026-10-19T12:14:10Z")
```stacktrace com.inductiveautomation.ignition.common.xmlserialization.SerializationException: Error during serialization for property 'children' on object '\[ClientTagFolder\]com.inductiveautomation.factorypmi.application.sqltags.ClientTagFolder@79845723' at com.inductiveautomation.ignition.common.xmlserialization.serialization.DefaultObjectSerializationDelegate.serializeProperties(DefaultObjectSerializationDelegate.java:146) at com.inductiveautomation.ignition.common.xmlserialization.serialization.DefaultObjectSerializationDelegate.serialize(DefaultObjectSerializationDelegate.java:174) at com.inductiveautomation.ignition.common.xmlserialization.serialization.XMLSerializationContext.serialize(XMLSerializationContext.java:51) at com.inductiveautomation.ignition.common.xmlserialization.serialization.XMLSerializer.serialize(XMLSerializer.java:569) at com.inductiveautomation.ignition.common.xmlserialization.serialization.XMLSerializer.serializeBinary(XMLSerializer.java:552) at com.inductiveautomation.ignition.common.xmlserialization.serialization.XMLSerializer.serializeBinary(XMLSerializer.java:544) at com.inductiveautomation.factorypmi.designer.model.VisionDesignerImpl.serializeProjectResource(VisionDesignerImpl.java:1130) at com.inductiveautomation.factorypmi.designer.model.VisionDesignerImpl.syncAppToProject(VisionDesignerImpl.java:1207) at com.inductiveautomation.factorypmi.designer.model.VisionDesignerImpl.notifyProjectSaveStart(VisionDesignerImpl.java:699) at com.inductiveautomation.ignition.designer.IgnitionDesigner.lambda$getCommitTasks$46(IgnitionDesigner.java:1712) at com.inductiveautomation.ignition.designer.IgnitionDesigner.lambda$commitAll$41(IgnitionDesigner.java:1668) at java.base/java.util.stream.ReferencePipeline$3$1.accept(Unknown Source) at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(Unknown Source) at java.base/java.util.stream.AbstractPipeline.copyInto(Unknown Source) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source) at java.base/java.util.stream.AbstractPipeline.evaluate(Unknown Source) at java.base/java.util.stream.ReferencePipeline.reduce(Unknown Source) at com.inductiveautomation.ignition.designer.IgnitionDesigner.commitAll(IgnitionDesigner.java:1678) at com.inductiveautomation.ignition.designer.IgnitionDesigner.handleSave(IgnitionDesigner.java:1418) at com.inductiveautomation.ignition.designer.IgnitionDesigner$Handler.lambda$handleSaveAction$12(IgnitionDesigner.java:2773) at com.inductiveautomation.ignition.client.util.gui.progress.Task$FunctionWrapper.apply(Task.java:259) at com.inductiveautomation.ignition.client.util.gui.progress.Task$FunctionWrapper.apply(Task.java:249) at com.inductiveautomation.ignition.client.util.gui.progress.Task.lambda$runInternal$3(Task.java:215) at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) at java.base/java.util.concurrent.FutureTask.run(Unknown Source) at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.base/java.lang.Thread.run(Unknown Source) Caused by: com.inductiveautomation.ignition.common.xmlserialization.SerializationException: Error during serialization for property 'children' on object '\[ClientTagFolder\]com.inductiveautomation.factorypmi.application.sqltags.ClientTagFolder@7df725f' at com.inductiveautomation.ignition.common.xmlserialization.serialization.DefaultObjectSerializationDelegate.serializeProperties(DefaultObjectSerializationDelegate.java:146) at com.inductiveautomation.ignition.common.xmlserialization.serialization.DefaultObjectSerializationDelegate.serialize(DefaultObjectSerializationDelegate.java:174) at com.inductiveautomation.ignition.common.xmlserialization.serialization.XMLSerializationContext.serialize(XMLSerializationContext.java:51) at com.inductiveautomation.ignition.common.xmlserialization.serialization.delegates.ArrayListDelegate.serialize(ArrayListDelegate.java:23) at com.inductiveautomation.ignition.common.xmlserialization.serialization.delegates.ArrayListDelegate.serialize(ArrayListDelegate.java:16) at com.inductiveautomation.ignition.common.xmlserialization.serialization.XMLSerializationContext.serialize(XMLSerializationContext.java:51) at com.inductiveautomation.ignition.common.xmlserialization.serialization.DefaultObjectSerializationDelegate.writeCall(DefaultObjectSerializationDelegate.java:82) at com.inductiveautomation.ignition.common.xmlserialization.serialization.DefaultObjectSerializationDelegate.writeCall(DefaultObjectSerializationDelegate.java:70) at com.inductiveautomation.ignition.common.xmlserialization.serialization.DefaultObjectSerializationDelegate.doProperty(DefaultObjectSerializationDelegate.java:122) at com.inductiveautomation.ignition.common.xmlserialization.serialization.DefaultObjectSerializationDelegate.serializeProperties(DefaultObjectSerializationDelegate.java:143) ... 29 more Caused by: com.inductiveautomation.ignition.common.xmlserialization.SerializationException: Unable to create clean copy of class com.inductiveautomation.ignition.common.script.builtin.PyDataset at com.inductiveautomation.ignition.common.xmlserialization.serialization.XMLSerializer.getCleanCopy(XMLSerializer.java:632) at com.inductiveautomation.ignition.common.xmlserialization.serialization.XMLSerializationContext.getCleanCopy(XMLSerializationContext.java:73) at com.inductiveautomation.ignition.common.xmlserialization.serialization.DefaultObjectSerializationDelegate.serializeProperties(DefaultObjectSerializationDelegate.java:135) at com.inductiveautomation.ignition.common.xmlserialization.serialization.DefaultObjectSerializationDelegate.serialize(DefaultObjectSerializationDelegate.java:174) at com.inductiveautomation.ignition.common.xmlserialization.serialization.XMLSerializationContext.serialize(XMLSerializationContext.java:51) at com.inductiveautomation.ignition.common.xmlserialization.serialization.DefaultObjectSerializationDelegate.writeConstructor(DefaultObjectSerializationDelegate.java:224) at com.inductiveautomation.ignition.common.xmlserialization.serialization.DefaultObjectSerializationDelegate.serializeConstructor(DefaultObjectSerializationDelegate.java:214) at com.inductiveautomation.ignition.common.xmlserialization.serialization.DefaultObjectSerializationDelegate.serialize(DefaultObjectSerializationDelegate.java:170) at com.inductiveautomation.ignition.common.xmlserialization.serialization.XMLSerializationContext.serialize(XMLSerializationContext.java:51) at com.inductiveautomation.ignition.common.xmlserialization.serialization.DefaultObjectSerializationDelegate.writeCall(DefaultObjectSerializationDelegate.java:82) at com.inductiveautomation.factorypmi.designer.xmlserialization.ProjectTagDelegate.serializeProperties(ProjectTagDelegate.java:39) at com.inductiveautomation.ignition.common.xmlserialization.serialization.DefaultObjectSerializationDelegate.serialize(DefaultObjectSerializationDelegate.java:174) at com.inductiveautomation.ignition.common.xmlserialization.serialization.XMLSerializationContext.serialize(XMLSerializationContext.java:51) at com.inductiveautomation.ignition.common.xmlserialization.serialization.delegates.ArrayListDelegate.serialize(ArrayListDelegate.java:23) at com.inductiveautomation.ignition.common.xmlserialization.serialization.delegates.ArrayListDelegate.serialize(ArrayListDelegate.java:16) at com.inductiveautomation.ignition.common.xmlserialization.serialization.XMLSerializationContext.serialize(XMLSerializationContext.java:51) at com.inductiveautomation.ignition.common.xmlserialization.serialization.DefaultObjectSerializationDelegate.writeCall(DefaultObjectSerializationDelegate.java:82) at com.inductiveautomation.ignition.common.xmlserialization.serialization.DefaultObjectSerializationDelegate.writeCall(DefaultObjectSerializationDelegate.java:70) at com.inductiveautomation.ignition.common.xmlserialization.serialization.DefaultObjectSerializationDelegate.doProperty(DefaultObjectSerializationDelegate.java:122) at com.inductiveautomation.ignition.common.xmlserialization.serialization.DefaultObjectSerializationDelegate.serializeProperties(DefaultObjectSerializationDelegate.java:143) ... 38 more Ignition v8.3.10 (b2026100610) Java: Azul Systems, Inc. 17.0.20.1 ``` ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [October 19, 2026, 5:10pm UTC](https://forum.inductiveautomation.com/t/error-during-serialization-for-property/117522/4 "2026-10-19T17:10:46Z")
The relevant bit is this: `Caused by: SerializationException: Unable to create clean copy of class PyDataset` From the rest of the stacktrace, it looks like you've managed to put a PyDataset directly into a client tag's data, presumably via scripting. I would have expected that to pass through cleanly, but apparently there's an issue. You could try wrapping the dataset you're writing in to the tag in `system.dataset.toDataset` to forcibly coerce it, which might solve the problem. Otherwise I'd recommend contacting support so we can start an official issue for this.