Hi, I am using COMSOL multiphysics 5.3a to model high-frequency ultrasound analysis of soft material. I was coupling Acoustics and Solid Mechanics physics for my modeling. During the simulation, an error message is popping up showing I have to one of the module from Acoustics Module, MEMS Module or Structural mechanics Module. Which module would be the best choice in this particular field of modeling? The error message is attached here.

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