Jason.k
Ansys Employee

Hello Volter, 

We appreciate your reaching out to Ansys Learning Forum. 

At a first point of view, please, make sure that you are using a symmetrical structure. This aims to make the lattice pairs to "see" identical meshes.

Secondly, we would appreciate the fact of pointing out the errors and/or the mesh feedback in order to had a more robust image.
Since I am not 100% sure of the nature of the error that comes up, by experience, I would advice you to use the latest version (AEDT 24R2). Moreover, in 25R1 version, we have implemented a new approach leading to a flawless simulation considering the Lattice Pairs approach. Unfortunatelly, I am not able to provide an exact release date. 

I hope this helps! 

Kind regards, 
Jason.Â