[Pw_forum] about vc-relax

[Ezad Shojaee]

hi
i want to do a vc-relax for TiO2 and when i set the parameter " dt " greater 
than about  " 1 " , i get this message :

from checkallsym : error #     5
not orthogonal operation

i wander if anyone knows the exact role of the " dt " parameter & the 
meaning of the error ?
thanks

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