Receiving error when trying to animate a custom rig with Roblox's Animation Editor

[WeeBobogame]

I have imported a custom model, rigged with bones, from Blender. However I cannot animate it using Roblox’s Animation Editor despite me cross-referencing the Motor6Ds created when imported, with the ones that come with a normal avatar.

I also cannot tell if this is an issue with the rigging process I did in Blender, if this is a Roblox Studio issue when trying to apply Motor6Ds, or something entirely else.

Going through the Developer Forums have led me no-where from what I’ve tried, so I decided to ask.

Error message shown here.

Any leads or help would be much appreciated.

[WeeBobogame]

Any help would be much appreciated, I desperately need a pointer or help as this is something I would like to look into for my current project.