[Pw_forum] unknown mode symmetry in phonon calculation

[Khalid Ibne Masood Khalid]

Dear Researchers,
I am trying to calculate phonon dispersion of my material, but when I run
ph.x, it gives the following error:

Error in routine find_mode_sym (1):
     unknown mode symmetry

The crystal was fully relaxed and there was no problem in the system.

Would you please suggest me what can I do regarding this problem.

Thank you.
Khalid
M. Sc student
BUET
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