There is errors in your 3d file
The console says:
tetgen.exe : Detecting self-intersecting facets...
tetgen.exe : Facet #779 duplicates facet #785 at triangle:
tetgen.exe : ( 391, 217, 219) and ( 217, 391, 219)
tetgen.exe : Facet #760 duplicates facet #778 at triangle:
tetgen.exe : ( 383, 11, 13) and ( 11, 383, 13)
tetgen.exe : Facet #760 duplicates facet #778 at triangle:
tetgen.exe : ( 383, 11, 13) and ( 11, 383, 13)
tetgen.exe : A self-intersection was detected. Program stopped.
You should review your 3d model and remove duplicates facets.
If your can't achieve that, please try this tutorial
http://i-simpa-wiki.readthedocs.io/en/latest/tutorial_Elmia_hall.htmlYou can also simplify your 3d model by removing the extruded features on the walls.