2d dteady state heat transfer

Hi,

I just starting to learn & use CalculiX. The problem I want to solve is a very simple 2d steady state heat transfer problem.

From gmsh, I exported the mesh as inp file and I start completing the file to describe the problem, but when running calculix I get the following error message :

*ERROR in gen3delem: first thickness
        in node            1  of element            1
        is zero

I’d really appreciate any help to fix the problem

The files can be found here : drive

Thanks.

PS : I’m not sure about the element types (T3D2 & CPS3) for 2d thermal