<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div><span>Dear all</span></div><div><br><span></span></div><div><span> I have tried doing a vc-relax on the attached TiO2 rutile supercell,</span></div><div><span>the calculations stop after a few minutes without giving any error. <br></span></div><div><span>What might be the problem?<br></span></div></div></body></html>