Dear Blaha: Thank you for your suggestion! I do the volume optimization several times and it always occur LAPW2 crashed during the first scf cycle! I use WIEN2k_08 Thank you! ljqian -------------- next part -------------- An HTML attachment was scrubbed... URL: http://zeus.theochem.tuwien.ac.at/pipermail/wien/attachments/20090505/c09e1180/attachment.html