How to simulate photonic bandgap using bandsolve

Hi everybody

I want to calculate band diagram of my photonic bandgap structure with bandsolve.

I just started to learn how to use bandsolve.

So, I tried to simulate photonic bandgap structure using "Air-spaced GaN nanopillar photonic band gap structures patterned by nanosphere lithography" (hxxp://jap.aip.org/resource/1/japiau/v109/i2/p023107_s1) for reference.

But, my simulation result is different with that of the reference.(I used same structure of the reference)

I cant find problem of my simulation.

Is there anybody to help me?
(I can send you my simulation file)

thanks for your help