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Error using analytic function of density for air

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Dear Dr. Nagi Elabbasi,

Greetings and May God bless you.
I humbly would like to seek for your expert comment on the study that I am doing and maybe ask for some insights on where did i made mistakes in the setting up of the model.
I tried to model heat transfer and fluid flow in a box.
However, when the solver is executed an error would appear as

''Failed to evaluate variable Jacobian.''
- Variable: pA
- Geometry: 1
- Domain: 1 2 4

I find some studies posted in the forum using a similar analytic function for air and theirs have run smoothly and without any error.
I'm attaching the file that I made (Testing) and my reference so that you can have a look.
Thank you very much in advance.

Jonathan

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