U Abinash Patro

hi I am stil unable to resolve this. The error doesnt show for the parameters of unit cell original file. I dont know why it only shows for my parameters.Here are the parameters I used for which I got an error:

wavelength: 390 nm, pilllar user defined dielectric index: 2.365,substrate: Si02 glass,period:250 nm, radius sweep: 40-85 nm, height sweep:300-500nm.

But when my period was increased to 300nm, there wasnt any error. Are there any conditions for which we have to set our period or other parameters to have a errorless simulation?