Rotobrush 2 "Unknown Exception"

Hello,

I've been trying to use Rotobrush 2.0 on 'best' settings but it doesn't propagate past around frame 100, an error message comes up "After Effects Error: Unknown Exception" Afterwards the playback source is a black screen.

I have tried emptying and relocating the Disk Cache, and using the 17.7 beta. I'm using 17.5.1. but have the exact same issue.

I had less of a problem using the standard version of rotobrush but the error still comes up sometimes.

All help is appreciated!

Intel® Core™ i7 6500U Processor