Hello, thanks for the clear video showing your issue.
I paused the video when the error was reported at the bottom of the screen and it wasn't one I was familiar with.
I think the problem is that the cloth isn't robust enough to deal with the amount of constraining you're doing to it.
From our side, we've stopped recommending that people use ziva cloth for a while now yet the notion seems to be a persistent one 🙂 (probably because that lion asset is kind of old now, we might want to update it)
Consider using this workflow for fat and skin: https://zivadynamics.com/resources/fat-skin-workflow
And if you're feeling adventurous, solving everything in one pass (muscles and fat all in one scene)