# Packaging error due to Unknown Structure ?

**URL:** <https://forums.unrealengine.com/t/packaging-error-due-to-unknown-structure/1771123>\
**Category:** Blueprint\
**Tags:** unreal-engine, bug-report, question, Blueprint\
**Created:** [March 25, 2024, 8:03am UTC](https://forums.unrealengine.com/t/packaging-error-due-to-unknown-structure/1771123 "2024-03-25T08:03:53Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![HecatosBluerive](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@HecatosBluerive](https://forums.unrealengine.com/u/HecatosBluerive)\
**Post date:** [March 25, 2024, 8:03am UTC](https://forums.unrealengine.com/t/packaging-error-due-to-unknown-structure/1771123/1 "2024-03-25T08:03:54Z")

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Hey !  
I’ve been trying to package my game but unfortunately an error has been coming up :  
UATHelper: Packaging (Windows): LogInit: Display: LogProperty: Error: FStructProperty::Serialize Loading: Property ‘StructProperty /Game/Inventory/Items/BP\_TestActor.BP\_TestActor\_C:LookAt:CallFunc\_GetDataTableRowFromName\_OutRow’. Unknown structure.  
UATHelper: Packaging (Windows): LogInit: Display: LogProperty: Error: FStructProperty::Serialize Loading: Property ‘StructProperty /Game/Inventory/UI/WBP\_DragPreview.WBP\_DragPreview\_C:ExecuteUbergraph\_WBP\_DragPreview:CallFunc\_GetDataTableRowFromName\_OutRow’. Unknown structure.  
UATHelper: Packaging (Windows): LogInit: Display: LogProperty: Error: FStructProperty::Serialize Loading: Property ‘StructProperty /Game/Inventory/UI/WBP\_InventorySlot.WBP\_InventorySlot\_C:ExecuteUbergraph\_WBP\_InventorySlot:CallFunc\_GetDataTableRowFromName\_OutRow’. Unknown structure.

I can’t find a solution to it. Can you help me with that ?

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**Author:** ![Sitiana](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/sitiana/32/1194605_2.png) [@Sitiana](https://forums.unrealengine.com/u/Sitiana)\
**Post date:** [March 25, 2024, 8:25am UTC](https://forums.unrealengine.com/t/packaging-error-due-to-unknown-structure/1771123/2 "2024-03-25T08:25:43Z")

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Hi, this line should be a hint for you:

`/Game/Inventory/Items/BP_TestActor.BP_TestActor_C:LookAt:CallFunc_GetDataTableRowFromName_OutRow’. Unknown structure.`

Check LookAt function in BP\_TestActor, it should have runtime error. Maybe you deleted or renamed a variable in a struct?

If this actor doesn’t have runtime error, try refreshing all nodes: Go to EditorPreferences and check if you have any key bound to RefreshAllNode. If not, bind something comfortable (I usually use ctrl + R). Then go to test actor and press that key to refresh nodes. It should show the error or fix this error.

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**Author:** ![HecatosBluerive](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@HecatosBluerive](https://forums.unrealengine.com/u/HecatosBluerive)\
**Post date:** [March 25, 2024, 8:35am UTC](https://forums.unrealengine.com/t/packaging-error-due-to-unknown-structure/1771123/3 "2024-03-25T08:35:13Z")

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Thank you for your answer. I went to the Blueprint and I was able to correct the problem. I needed to compile it again and do the same for two others Blueprints.  
Thank you again!  
Have a great day !

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**Author:** ![system](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/1/3/713c9d3f58553f0de89543d76a8a3a2779dc9fa4.png) [@system](https://forums.unrealengine.com/u/system)\
**Post date:** [April 24, 2024, 8:35am UTC](https://forums.unrealengine.com/t/packaging-error-due-to-unknown-structure/1771123/4 "2024-04-24T08:35:20Z")

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