Mesh failed after assembly

[Toutanfil]

Hello,

First, excuse me for my english.
Second, i'm trying to make an assembly (with FEM) after making an assembly with A2plus.
But as you can see on this picture, my mesh is a little ... break.

Error message:

CalculiX returned an error due to nonpositive jacobian determinant in at least one element
Use the run button on selected solver to get a better error output.
15:30:10 Error()
15:30:10
15:30:10 CalculiX read results...
15:30:10 Read ccx results from frd file: C:\Users\user\AppData\Local\Temp\fcfem_qwbht5c7\FEMMeshGmsh.frd
15:30:10 Nodes, but no results found in frd file. It means there only is a mesh but no results in frd file. Usually this happens for:
- analysis type 'NOANALYSIS'
- if CalculiX returned no results (happens on nonpositive jacobian determinant in at least one element)
- just no frd results where requestet in input file (neither 'node file' nor 'el file' in output section')

It's not the first time I've this error message but this time, I don't find anything to solve it.
I rebuild my 2 parts and the problem continu.
This problem appears just with this 2 parts.


I'm using last FreeCAD version

OS: Windows 10 Version 2004
Word size of FreeCAD: 64-bit
Version: 0.20.29177 (Git)
Build type: Release
Branch: releases/FreeCAD-0-20
Hash: 68e337670e227889217652ddac593c93b5e8dc94
Python 3.8.10, Qt 5.15.2, Coin 4.0.1, Vtk 8.2.0, OCC 7.6.2
Locale: French/Belgium (fr_BE)
Installed mods:
* A2plus 0.4.56a
* Assembly3 0.11.3
* Assembly4 0.11.12
* fasteners 0.3.40
* Manipulator 1.4.9
* MOOC 2022.4.21

I add my 2 parts and the assembly.

If someone could help me to become my Freecad hero!

[NewJoker]

It should work if you use Netgen instead of Gmsh. But there are also some tricks that may help eliminate this error with Gmsh: https://wiki.freecadweb.org/FEM_MeshGmshFromShape#Notes