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Thermal Simulation Error

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emily.dXPN3C
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Thermal Simulation Error

I get the following error message when trying to run a electronics thermal simulation on a PCB: Stiffness Matrix Singular or Non-Positive Definite (see attached picture). I have tried both increasing the automatic contact tolerance and decreasing the mesh size, which doesn't seem to work. I'm not sure that I can simply the board any further than I already have. Looking at the degree of freedom view shows no issues.

 

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