Thanks for sharing these pictures. I am not able to test on my end so I cannot tell the exact solution. However,
1. Would you please check if all faces are mappable? If not, please modify the geometry accordingly.
2. Would you please check if any edge or face is over-defined, i.e., more than one methods or sizing controls are added to a single entity?
3. It seems to me the geometry has symmetric structures. Is it possible to mesh a quarter of it and apply periodic conditions in the solver?
4. If the geometry is symmetric but the physics is not, please refer to links below for tips to mesh repetitive geometries.