Some problems of Bandgap Analysis of Photonic Crystal (ver 3.5)

Hello All,

I am trying to run the built-in model of Bandgap Analysis in ver 3.5. But I got some problem:

Error: 6170
Failed to evaluate variable.
- Variable: lambda
- Global scope
Failed to evaluate expression.
- Expression: imag(lambda)
Failed to evaluate expression.
- Expression: -imag(lambda)/(2*pi)

Am I supposed to give some initial value of lambda somewhere?

By the way, way the ver4.0 does not provide this model? Does it still support this calculation for 4.0?

Thank you!!
Xing