# SerializationException (I have no idea about this error)

**URL:** <https://forum.inductiveautomation.com/t/serializationexception-i-have-no-idea-about-this-error/9371>\
**Category:** Ignition\
**Created:** [November 23, 2014, 2:44am UTC](https://forum.inductiveautomation.com/t/serializationexception-i-have-no-idea-about-this-error/9371 "2014-11-23T02:44:42Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![wasp26](https://avatars.discourse-cdn.com/v4/letter/w/a698b9/32.png) [@wasp26](https://forum.inductiveautomation.com/u/wasp26)\
**Post date:** [November 23, 2014, 2:44am UTC](https://forum.inductiveautomation.com/t/serializationexception-i-have-no-idea-about-this-error/9371/1 "2014-11-23T02:44:42Z")

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Hi Ignition,

Just wondering if you guys have any input about this error. I have a button that will pass a dataset to a custom property on a different window when clicked, and every time i tried to save the project, this error pops up.

SerializationException: Error during serialization for property ‘interactionController’ on object ‘[FPMIWindow]display’  
caused by SerializationException: Error during serialization for property ‘generalAdapters’ on object ‘[DefaultInteractionController]com.inductiveautomation.factorypmi.application.binding.DefaultInteractionController@8a8930’  
caused by SerializationException: Error during serialization for property ‘data’ on object ‘[PMITable]PMITable[Table]’  
caused by TypeError: unhashable type: ‘list’

Ignition v7.7.1 (b2014092209)  
Java: Oracle Corporation 1.7.0\_71

Your inputs will be highly appreciated.

Thanks.

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**Author:** ![mazeyrat](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/mazeyrat/32/10955_2.png) [@mazeyrat](https://forum.inductiveautomation.com/u/mazeyrat)\
**Post date:** [November 23, 2014, 7:59am UTC](https://forum.inductiveautomation.com/t/serializationexception-i-have-no-idea-about-this-error/9371/2 "2014-11-23T07:59:22Z")

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When you save a windows, contents of dataset are serialized to be saved  
Perhaps something about the contents of you dataset ?

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**Author:** ![nmudge](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nmudge/32/3394_2.png) [@nmudge](https://forum.inductiveautomation.com/u/nmudge)\
**Post date:** [November 23, 2014, 4:43pm UTC](https://forum.inductiveautomation.com/t/serializationexception-i-have-no-idea-about-this-error/9371/3 "2014-11-23T16:43:44Z")

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Yes, perhaps a list is in the dataset and shouldn’t be.