Hi,
the warning just states that it was unable to print the fields of intern variables (as there is only a linear-elastic material which does not have any intern variables). You can ignore this warning, or just remove the IMPR_NOM_VARI=‘OUI’.
If I am not wrong *_ELNO fields can only exist for structural elements like shells and beams, which you don’t have in your model, so calculating them fails.
Best,
Richard