I'm getting error with my Rig

Hello !
I don’t know if it’s the right place to post my issue, but here it is.
I’m trying to animate this rig :
Problem is that when I try to animate it, with Animation Editor, it shows me this :
I’m using this : https://www.roblox.com/library/2908380847/Rig-Editor to make my joint
What is the problem? I can provide screen of the joint

Can u provide a screenshot from the explorer which leads to all the parents and children from the rig? It will be clearer and easyer for me to solve your problem.

Try to use Moon Animator.
It’s a more powerful tool that can keyframe also properties, try to use the plugin. If you don’t know how u use it watch the tutorial from YouTube. There are many different videos.
Or you can read this topic: Getting Started with Moon Animator 2 - [Unofficial]