Help! -- "Index>=0 && Index<NumBits" -- Control Rig Error??

Hi,

I have created a custom BP character in Unreal, using Animation Blueprints and a Control Rig.

When I simulate my scene - everything works great. The character works with my controller inputs, etc. Physics included. My control rig is working as it should and when I stop simulating everything still works.

BUT…

When I try to use the Sequencer, and manually animate my character using my control rig, AND THEN hit simulate - the scene actives and runs BUT as soon as I stop the simulation… Unreal crashes and I get the error message.

“Index>=0 && Index<NumBits”

I assume it has something to do with my blueprint and control rig, but to be frank, I have no clue how to solve this.

Is there a way to check what is causing the index error?

Any help??

Much appreciated in advance!
Thanks!