Hole issue and Index is out of bound for axis 0. Can not handle nonmanifold mesh.

Hi there i was trying to implement this python package on some triangular mesh files but firstly i encountered hole presence and non manifold edges and vertices issues, which i have resolved manually but now i am encountering an error using BFF function which says:

<img width="535" alt="issue" src="https://github.com/russelmann/confmap/assets/79933197/94797430-8ca7-4481-98fb-dc723d326fad">
