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Dear all:

I had the same problem to calculate the frequency-dependent dielectric tensor 
of silver bulk.We know that the silver bulk has 11 electrons,I must set nband 
at least to 6.But I got the similar ERROR showed that :
 
 In non-linear calculation, nband must be equal
 to the number of valence bands.

So how to set nband? Or what should I do?

Thanks for your help.
                                                 Henry Chen