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Hello

I model a simple cantilever beam using solid elements . Although the solid meshing is sucessully formed (see Cantilever_I_beam_BilinIMK_Solid.rar), I take an error during the run of tis model (see Error_cantilever_I_beam_BilinIMK_Solid.PNG).

What must I do?

I would like also to add an another important detail about the meshing of this W shaped steel profile:

In fact, there does not exist any meshing problem before using the command "union" (see _cantilever_I_beam_Solid_RegularMeshing.png)

But after using the command "union", then , the meshing does not regularly formed (see Error_cantilever_I_beam_Solid_Meshing.PNG)

I model a simple cantilever beam using solid elements . Although the solid meshing is sucessully formed (see Cantilever_I_beam_BilinIMK_Solid.rar), I take an error during the run of tis model (see Error_cantilever_I_beam_BilinIMK_Solid.PNG).

You cannot use a rigidDiaphragm (6 DOFs) for a solid model (3 DOFs).
Also I don't understand what you are trying to do:
The rigidDiaphragm is a multi point constraint, not a load. You are doing an analysis without any load.
I think you are trying to "link" a node with the top-face of the beam so that you can apply concentrated forces and moments on that point, and the "link" will transfer those forces to the face of the beam.
If this is the case:

1. You need a node-node interaction, master = node, slave = top-face
2. assign a constraints->mp->beamSolidCoupling to this interaction
3. Apply concentrated forces to that node

But after using the command "union", then , the meshing does not regularly formed (see Error_cantilever_I_beam_Solid_Meshing.PNG)

Share the updated model to check the issue