Hi everyone,   We are currently experemementing lattice optimization on a cubic (just a try in order to experiment more difficult pieces after). We created the model on Hypermesh, selecting lattice optimization. But , in Optistruct, when we open the ..._lattice.fem, we have the following error :   *** INTERNAL PROGRAMMING ERROR ***  in file "dsetio_inc.h", at location #132.     Please note that we already tried to open the results of the topological optimi