<html><head></head><body><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;"><div>Hello, </div><div>I need to <span><span style="color: rgb(0, 0, 0); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; font-size: 16px;">I am trying to do structural optimization</span></span> Ca9(PO4)6</div><div>when I am trying to run the calculation it always gives me error.</div><div>attached the input file </div></div></body></html>