Doom 3 BFG edition - cannot spawn characters

I cannot spawn any characters using the console in Doom 3 BFG edition. This is what I see when I try spawn char_hazmat:

] spawn char_hazmat
Writing generated/rendermodels/models/md5/chars/hazmat.bmd5mesh
WARNING: file def/npcs.def. line 1021: Model 'models/md5/chars/hazmat.md5mesh' defaulted
....... Game Map Shutdown .........
...................................
*******************
ERROR: gib model 'models/md5/chars/skeleton.md5mesh' has different
number of joints than model 'char_hazmat'
*******************
] D3BFG 1.1400.346456

Then I have to force the game to exit by typing exit.

How do I spawn characters?