# How to replace the message "Unknown error message" with more details when packaging a game project ?

**URL:** <https://forums.unrealengine.com/t/how-to-replace-the-message-unknown-error-message-with-more-details-when-packaging-a-game-project/1673433>\
**Category:** Programming & Scripting\
**Tags:** unreal-engine, FeatureRequest, crash, bug-report, question\
**Created:** [February 8, 2024, 1:33am UTC](https://forums.unrealengine.com/t/how-to-replace-the-message-unknown-error-message-with-more-details-when-packaging-a-game-project/1673433 "2024-02-08T01:33:34Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![imagineer](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/imagineer/32/562003_2.png) [@imagineer](https://forums.unrealengine.com/u/imagineer)\
**Post date:** [April 29, 2024, 6:44pm UTC](https://forums.unrealengine.com/t/how-to-replace-the-message-unknown-error-message-with-more-details-when-packaging-a-game-project/1673433/3 "2024-04-29T18:44:15Z")

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Common problem:

> [@how should I fix this packaging error?](https://forums.unrealengine.com/t/how-should-i-fix-this-packaging-error/1189670):
>
> hey everyone. please help me to fix this error. I got this kind of error repeating in my Output log when I tried to package my game in ue5.1 and I don’t even know where to look for the problem! PackagingResults: Error: begin: stack for UAT PackagingResults: Error: === Handled ensure: === PackagingResults: Error: Ensure condition failed: ClassDefaultObject [File:D:\build++UE5\Sync\Engine\Source\Runtime\Engine\Private\BlueprintGeneratedClass.cpp] [Line: 1635] PackagingResults: Error: Stack: …

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