<div>Hi,</div><div>it is hard to help without more information but a few ideas:<br></div><div>You probably want to set MULTIPLE_UNIT_CELL in both the CELL (to replicate the box) and the TOPOLOGY (to replicate the atoms) sections.</div><div>Also be careful restarting from a restart file if you have set MULTIPLE_UNIT_CELL and check it is doing what you expect.</div><div>Also set PRINT_LEVEL to medium and see if the cell / coordinate parameters are what you expect.</div><div>Matt<br></div><div><br></div><br><div class="gmail_quote"><div dir="auto" class="gmail_attr">On Wednesday, 30 November 2022 at 18:28:03 UTC qumingzi...@gmail.com wrote:<br/></div><blockquote class="gmail_quote" style="margin: 0 0 0 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">I use the cp2k to do the structure optimization. When I use 2*2*@ supercell, everything is fine, but if I use 4*4*4 supercell. It shows "GEOMETRY wrong or EMAX_SPLINE too small!". I'm so confused. Someone could help me? Thank you very much!</blockquote></div>
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