# Unknown Structure Error

**URL:** <https://forums.unrealengine.com/t/unknown-structure-error/2238831>\
**Category:** Programming & Scripting\
**Tags:** package, unreal-engine, package-project, package-error, question\
**Created:** [December 23, 2024, 4:41pm UTC](https://forums.unrealengine.com/t/unknown-structure-error/2238831 "2024-12-23T16:41:25Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![T4l\_R](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@T4l\_R](https://forums.unrealengine.com/u/T4l_R)\
**Post date:** [December 23, 2024, 4:41pm UTC](https://forums.unrealengine.com/t/unknown-structure-error/2238831/1 "2024-12-23T16:41:26Z")

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Hi,  
When I try to package my project I get lots of unknown structure errors coming from something with data table row out rows. I don’t get any errors during runtime before packaging and I didn’t get these errors before upgrading the engine version (from 5.4 to 5.5).  
I can also tell the the path mentioned in the error is wrong, for example:  
“LogProperty: Error: FStructProperty::Serialize Loading: Property ‘StructProperty /Game/UI/Asset/UI\_Asset\_Widget.UI\_Asset\_Widget\_C:PopulateVariationBox:CallFunc\_GetDataTableRowFromName\_OutRow’. Unknown structure.” - I can tell the it points to “Game/UI”. The UI folder used to be inside the Game folder, but I moved it out of there.  
Anyone knows how to solve this?

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**Author:** ![Ja20121](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Ja20121](https://forums.unrealengine.com/u/Ja20121)\
**Post date:** [February 15, 2025, 9:13am UTC](https://forums.unrealengine.com/t/unknown-structure-error/2238831/2 "2025-02-15T09:13:50Z")

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Hey. I guess it is kinda late, but anyway here is what u can do to fix it.  
Just in case if somebody stumble same problem.  
In UE5

1. Open your BP in error (UI\_Asset\_Widget)
2. Click File-\>Refresh All nodes

 ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/d/3/5/d3551d6a39154652c4f0944fb4756ba332fbe847.png)

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**Author:** ![Ja20121](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Ja20121](https://forums.unrealengine.com/u/Ja20121)\
**Post date:** [February 15, 2025, 9:41am UTC](https://forums.unrealengine.com/t/unknown-structure-error/2238831/3 "2025-02-15T09:41:29Z")

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also found this video, that could be solution to not create such problems in future with structs [https://www.youtube.com/watch?v=aMGEqsGIrcI](https://www.youtube.com/watch?v=aMGEqsGIrcI) . Didn’t triet yet, but sound promising

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**Author:** ![FrostyJas](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/frostyjas/32/1194640_2.png) [@FrostyJas](https://forums.unrealengine.com/u/FrostyJas)\
**Post date:** [February 17, 2025, 6:26am UTC](https://forums.unrealengine.com/t/unknown-structure-error/2238831/4 "2025-02-17T06:26:30Z")

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Hey @Ja20121

Thank you for providing the find! This will help other members who run into this.

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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:** [March 19, 2025, 6:26am UTC](https://forums.unrealengine.com/t/unknown-structure-error/2238831/5 "2025-03-19T06:26:31Z")

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