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Editor Crashes When Applying Physical Anim Settings

I’m relatively new to Unreal and I’m getting a crash that I don’t understand. I have a mesh that uses an auto-generated physics asset and I’m trying to apply Physical Animation to the tail, but whenever I call the ApplyPhysicalAnimationSettingsBelow node on it, the editor crashes. Looking at the log, it seems to be throwing an Index out of Range exception where the array size is 0, but I’m not sure what array the node is trying to reference. (I would assume it’s the array of bones, but it seems to properly get the index of the bone I’m giving it, so I’m stumped.)

For reference, I’ve been following Matthew Palaje’s video: Let’s Create Physical Animations. I’ve added the PhysicalAnimation component to the BP and set its Skeletal Mesh before calling ApplyPhysicalAnimationSettingsBelow, but it still crashes on that node. Any idea what could be causing this?

Thanks in advance for any help you can give.