Invalid RootIndex in AnimBlueprintGeneratedClass::Link

Development Character & Animation
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1

I have a custom animation node which is part of a plugin and at the time does nothing more than copying the input to the ouput.
I can add the node to a anim blueprint and it works without problems but when i save the blueprint and restart the engine an assertion AnimBlueprintGeneratedClass::Link fails, which ensure the Root Index is valid.

What could cause the rootIndex to be invalid?

NoNoid

2

The problem was that the module with the UAnimGraphNode wasn’t loaded early enough.
Changing the loading phase of the plugin to ‘PreDefault’ solved the problem.