UE 4.27 crashes when importing an FBX file with animations

Development Character & Animation
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UE 4.27 keeps crashing when i try to import an FBX file with animations, if i don’t import the animations it doesn’t crashes

Screenshot 2025-01-24 215201
Screenshot 2025-01-24 215201761×602 54.9 KB

Herobrine V5.fbx (458.2 KB)

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Hey there @OmegTubero! This error seems to be failing the Single root bone assertion. This can stem from having multiple root bones. In your model, all bones should have a parent besides the designated root, if that is the case, there could be other issues at play.

1 Like
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Hi, thank you for the reply, how can i do that in blender?

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I’d recommend just looking for bones in your hierarchy that have no parents. There is likely a bone they are meant to be parented to in most humanoid models. If there are none that match that description, it could be your IK handle bones causing it (if you have IK setup).