Surface integral in 2D models

Hi,
I am modeling heat transfer in a 2D model, with shell elements.
I want to calculate the heat flux in the surface of tree holes inside the piece, but when I select the surface of a hole and try to integrate heat flux using "Surface normal integral", I get "Some elements are not 3D volume elements."
How can I calculate this integral?
I think it must be good that Mecway accept shell faces for possible to calculate that Surface normal integral.

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