heeelp please
 

The mesh file exporter does not support overlapping geometry in named selections. Please resolve the issue and try again

what happen please ???????:confused::confused::confused::confused::co nfused::confused:

You have an (several) entities (surfaces, lines bodies) with 2 or more named selections. I mean, one entity belongs to 2 or more named selection. So check all the named selections on your mesher and look for the problemaic geometry