When editing rigs from the Animation editor plugin, you are met with this error and the plugin refuses to respond.
You can try this yourself by opening studio, spawning a basic dummy rig, opening the animation editor and trying to animate it. You’ll see after clicking the “create rig” button, the message disappears and causes the rest of the editor to stop, leaving the assetID error in the output. Afterwards the plugin refuses to respond.
The current studio version for this bug is 0.405.0.348052, And I currently run Roblox Studio on a MacBook Pro. Please feel free to share your feedback on the issue if you are experiencing it as well.