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Flouquet periodicity on Eigenfrequency analysis 3D

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Hi everyone!
I'm trying to obtain dispersion curves for a 2D periodic structure in 3D. Already build the geometry (basically a ball inside a box), assigned the materials, and set the Flouquet periodicity at all boundaries x,y,z. But all I get is:
Undefined value found.
- Detail: Undefined value found in the stiffness matrix.
and then it lists some points in the 3D geometry. But I already checked and they are meshed and have material setup. What could be wrong?
Thanks in advance for your time at reading/replying this.
Ruth

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