<div class="iw_mail" dir="auto" style="font-size: 13px;"><div>Dear Prof. Paolo Giannozzi,</div><div><br></div><div>Hi.</div><div>Kindly, when using USPPs then uncommenting "CALL forces()" line in QEROOT/PW/src/electrons.f90 calculates the forces at each iteration step.</div><div>However, when using PAW-PPs, it returns "**************************************" instead of numbers.</div><div>I would be grateful if you please help me to manage it.</div><div><br></div><div>Best regards,</div><div>Mahmoud Payami<div><br></div><div>NSTRI, AEOI</div><div>Tehran, Iran</div><div>Email: mpayami@aeoi.org.ir</div><div>Phone: +98(0)2182066504</div><div>------------------------------------<br></div></div></div>