laminar flow: a variable in a certain solid domain is undefined

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I am conducting heat transfer simulations in a microchannel. The fluid domain is represented by a rectangular block, and the material is water, while the solid domain is made of copper. Using the laminar flow module, after specifying the inlet velocity, the solver returns the following error message:

Undefined variable. - Variable: comp1.spf.U - Geometry: geom1 - Domain: 80 Cannot compute expression. - Expression: comp1.spf.U - Plot: Volume 1

After that, I looked for domain: 80, which points to a fin, but I don't understand why this fin would cause the laminar flow module to fail. Moreover, the fluid properties and the fluid domain in the laminar flow module do not involve this fin. How should I troubleshoot this error?


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