Copied Avatar Rig Configuration mis-match. Transform hierarchy does not match

Hi,
The version of my Unity is 2023-2.5f1.

Recently I have been using Maximo animations on my project. Today I downloaded some animations (Soccer Tackle, Sweep Fall) and I clicked on the “Rig” tab to change it like this:

Animation Type: Humanoid
Avatar Definition: Create From Other Avatar
Source: Ch38_nonPBRAvatar

As I click the Apply button the Animation Clip of the current animation disappears. And it says: Transform ‘mixamorig5:Hips’ for human bone ‘Hips’ not found.

Any help would be greatly appreciated.

Are you sure that your source model (Ch38_nonPBRAvatar) and the animations downloaded from Maximo share the same bone hierarchy? If not, you only need to set both the source model and these animations to Humanoid type (Create From This Model), and then you can apply these clips