<div dir="ltr"><div><div><div><div><div><div><div>Dear Researchers,<br></div>I am trying to calculate phonon dispersion of my material, but when I run ph.x, it gives the following error:<br><br>Error in routine find_mode_sym (1):
<br> unknown mode symmetry<br><br></div>The crystal was fully relaxed and there was no problem in the system.<br><br></div>Would you please suggest me what can I do regarding this problem.<br><br></div>Thank you.<br></div>Khalid <br></div>M. Sc student<br></div>BUET<br></div>