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why does "Undefined value found in the stiffness matrix" means?

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I'm trying to simulate Photonic crystal. As far as I know, there is no need for me to know the stiffness of material in the crystal.
However, when I click "compute", comsol always screen error message on T.T

In the model attatched, I intend to make a photonic crystal, such as 230nm thickness and square lattice structure.
Therefore, I give my boundaries Periodic bondary conditon and Scattering Boundary condition.

Anyway What is the problem with my model?

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