You’re at the anim limit.
Switch to XXL or reduce the anim count. Not sure what else you expected, you already know the problem and the solution.
If it helps, I’ve been using XXL for a bit over a year now and haven’t experienced any more crashes than usual.
Original URL: https://www.loverslab.com/topic/115256-fnis-error-at-animations-lower-than-10k/?do=findComment&comment=2498988