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Error: Equations of state are not allowed in a plane stress state

Error: Equations of state are not allowed in a plane stress state

Error: Equations of state are not allowed in a plane stress state

(OP)
I am getting the following error:

***ERROR: Equations of state are not allowed in a plane stress state

which seems very strait-forward, especially since I do use an equation of state (Eos Us-Up) do define one of my materials. This material is also given a density and viscosity. My problem is that, to my knowledge, I am *not* using a plane stress state, and do not want to. Is there anything I should check to address this? Is the problem that my model is 2D?

Thank you ahead of time,
Seth

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