[Pw_forum] Unknown Symmetry Error in ph.x.

Andrea Dal Corso dalcorso at sissa.it
Sun Sep 25 16:33:44 CEST 2016

You can use search_sym=.FALSE. in the phonon input to avoid this  
error, or provide the
input so we can see what is happening.


Quoting Mohammed Ghadiyali <m786g at live.co.uk>:

> Dear All,
> I am getting an error as
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     Error in routine find_mode_sym (1):     unknown mode symmetry  
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
>      stopping ...     unknown mode symmetry  
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> I am using PHONON v.5.4.0, the structure is a fully relaxed. The  
> structure is a dumbell stanene.
> Regards,Ghadiyali Mohammed Kader

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