Unreal getting crash with Octane while using Metahumans

[jitendra]

You will need to replace the Custom Nodes that failed to convert in the skin and eye material. You should be able to see which nodes dont work in the unreal logs.
Atleast a couple of the Custom Nodes dont work.

Can you explain this in detail with some image references or step by step guide as I am beginner in Unreal Engine.