Error during serialization for property

General Discussion
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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".

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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
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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.