I am sorry , I didn't realize my replies were not going to the groups. Now on I will ensure that.
" you have to do the read_restart _before_ changing the pair
style and kspace style".
Yes, the problem was with the reading sequence and now kspace calculation is on.
But my system is showing charged ( 0.01 total charge), which I didn't see before.
as my initial structure that I built in Cerius2 was neutral.
So I am again starting with the data file.
Thank you for all the suggestions.
Mousumi