Animation editor breaks on my custom rig

[rower86 (row)]

This bug is happening every time I attempt to create a custom rig, other rigs made in the past work fine, but for some reason I cannot get my own to be created. I have confirmed that no other plugin is causing it.

I create my rigs in the proper order (build, name parts, make joints, move joints), but after opening the animation editor from Roblox and clicking my rig this error is always popping up (exiting studio and re-entering does not work)

Here is a picture of my own rig’s hierarchy

Rig.rbxm (10.6 KB)

I’ve looked at the new rigs that people have uploaded and can confirm they are having the same problem so it must be a roblox glitch

The bug started happening after the 5th of January when I first started to learn about custom rigs, if this is not a bug, please tell me what I am doing wrong
all help is appreciated

[JollySunbro6]

Looks like the issue is stemming from no PrimaryPart being set on the model. The old animation editor does not handle this gracefully. This is no longer an issue in the beta, which will be replacing the old editor very soon!