Attempting to move fully simulated skeletal mesh error

Anyone happen to have any idea where to look if that above solution doesn’t work? I’ve tried fiddling with the constraints and root a bunch but nothing seems to solve the issue. It’s setup exactly as described in AlexanderSt’s post. If I set it to set simulated starting from “spine_01” it works fine without warnings but the character then of course only ragdolls from the waist up. Any help would be awesome, thanks!