# Packaging (Windows): ERROR: Cook failed

**URL:** <https://forums.unrealengine.com/t/packaging-windows-error-cook-failed/2298981>\
**Category:** Platform & Builds\
**Tags:** packaging-and-cookin, unreal-engine, packaging-projects, package-error, question\
**Created:** [January 23, 2025, 9:21am UTC](https://forums.unrealengine.com/t/packaging-windows-error-cook-failed/2298981 "2025-01-23T09:21:14Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Abdalah.Salameh](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/abdalah.salameh/32/905357_2.png) [@Abdalah.Salameh](https://forums.unrealengine.com/u/Abdalah.Salameh)\
**Post date:** [January 23, 2025, 9:21am UTC](https://forums.unrealengine.com/t/packaging-windows-error-cook-failed/2298981/1 "2025-01-23T09:21:14Z")

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Hello so i was trying to package my project and it keep on saying Packaging (Windows): ERROR: Cook failed and i do not know how to fix it so if you could find a solution that would be great

errors:

UATHelper: Cooking (Windows): LogProperty: Error: FStructProperty::Serialize Loading: Property ‘StructProperty /Game/ThirdPerson/Blueprints/MySaveGameObject.MySaveGameObject\_C:LevelData.LevelData’. Unknown structure.  
PackagingResults: Error: FStructProperty::Serialize Loading: Property ‘StructProperty /Game/ThirdPerson/Blueprints/MySaveGameObject.MySaveGameObject\_C:LevelData.LevelData’. Unknown structure.

1. UATHelper: Cooking (Windows): LogInit: Display: LogProperty: Error: FStructProperty::Serialize Loading: Property ‘StructProperty /Game/ThirdPerson/Blueprints/MySaveGameObject.MySaveGameObject\_C:LevelData.LevelData’. Unknown structure.

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<div class="post-metadata">

**Author:** ![brs-sebascova](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/brs-sebascova/32/1052483_2.png) [@brs-sebascova](https://forums.unrealengine.com/u/brs-sebascova)\
**Post date:** [January 23, 2025, 10:24pm UTC](https://forums.unrealengine.com/t/packaging-windows-error-cook-failed/2298981/2 "2025-01-23T22:24:01Z")

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Greetings @Abdalah.Salameh!

A similar error was encountered in another thread, please test the provided solution:

> [@Packaging error due to Unknown Structure ?](https://forums.unrealengine.com/t/packaging-error-due-to-unknown-structure/1771123):
>
> 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\_Drag…