I can't cook/package my game, and I can't really find the problem from the only 1 error.

[BRGEzedeRocco]

Hi @SteveLosive ,
I’ve been digging around the Unreal forums and found a few similar cases, maybe one of these solutions could help:

People suggest checking struct variables and using Refresh All Nodes in the affected Blueprints

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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_Drag…

In this post they fixed it by renaming the struct variable, recompiling and saving, or even recreating the struct from scratch

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I just encounter the same problem,and i googled it , i try to use a lot of methods, but it has not been resolved. at last , i renamed the struct. and build the project again. it was sucessed! you can try it.

others solved it by opening the Blueprints that reference the struct, running Refresh All Nodes, and compiling.

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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:Ca…

And lastly, this page explains why the error happens and the common steps to resolve it

Unreal Engine Tips: Fixing "Unknown structure" Packaging Error

Hope it helps!