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Welcome to the Meta Developer Forum!

Welcome to the Meta Developer Forum! This is a community-driven space where you can share insights, ask questions, and address challenges with fellow developers. Our goal is to create a supportive and respectful environment where everyone can learn f...

Packaging Error "class is not mapped when saving"

I periodically get a packaging error that only occurs on child blueprints. It causes an unrecoverable assertion:Assertion failed: !Export.ClassIndex.IsNull() [File:C:/OUE/Engine/Source/Runtime/CoreUObject/Private/UObject/SavePackage.cpp] [Line: 3807]...