Analysis don't start

I prepared a contact model with mixed shelle elements and hexahedral solids.
The analysis does not start because when the solver reads the mesh after correctly loading the shells, it crashes at the reading of the first element C3D8.

The file .12d ended with this line:
ELEMENT 1428 with label "S4R " and with nodes:
1518 305 10 376
is expanded into a "C3D8R L " element with topology:
222462 216615 214938 217562 222464 216617 214940 217564

The file .dat is enpty.
There is no error message other than Failed on the monitor window

Does anyone have any suggestions on how I can figure out where the problem comes from ?
Thanks in advance to those who can give me any support.

Try exporting the input file and running the analysis from the command line. Then check if there are any specific error messages.

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