Humanoid with IK "left foot transform is not a child of left lower leg transform"

Hey all,

I did a simple IK constraint on a model on blender following these tutorials:



It works great within Blender. Now when I want to import it in Unity, I get errors in the Humanoid Avatar mapping: "left foot transform is not a child of left lower leg transform". Which is true because I did this IK thing in Blender that I want to use.

Any idea how to bypass that? I want both IK from Blender and Humanoid Avatar in...

Humanoid with IK "left foot transform is not a child of left lower leg transform"