Amorphous cell_construction of polymer

Hi,

I am working on AC to construct a polymer with x y direction periodic boundary condition and z direction nonperiodic. So I use <> to construct a structure with  density of target 1.38g/cc.  Every chain contains 1553 atoms (see the fiche Polymotif50.xsd) and 10 chains are loaded.The type de forcefield is COMPASS. But the calcul stops with a error at 100% of progress. It gives me 10 configurations incomplete who had just 2 or 3 chains present.

I can't solve this problem. Have you give me any suggestion?

Thanks a lot!

ding