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No eigenpair solution selected

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Hi

I'm new in COMSOL. I want to find out eigenfrequencies of a pinned-pinned rectangular concrete beam.
this beam has 5X5 cm cross section. It is a simple problem but I have some problems in getting good results.

Boundary conditions are assigned to edges at two ends.
I selected frequency domain model & eigenfrequency as study.
I used swept mesh from edges that is simply supported.

earlier, I was selected eigenfrequency as study and I encountered with this message:
Failed to evaluate variable Jacobian.
- Variable: mat.rho
- Geometry: 1
- Edge: 3 5 7 8

these edges are longitudinal edges (with no support). So, I used frequency domain model, too. But I have problem yet.

Can everybody help me?
Thanks

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