Neigh error with lattice cmd

Hi
I want to fill the bonded particles in a region, as shown in attached figure. I am using lattice command for the same, however I am getting thr following error:
ERROR on proc 0: Neighbor list overflow, boost neigh_modify one (../neigh_gran.cpp:188)

I belive, it is related to the line# 135& 136 of the attached input script.
I am using 'nsq' instead of 'bin' since I was unable to insert the particles using bin.

Please suggest a way aroung the above problem.

Thanks
Shubham