en la consola de blender me aparece esto:
Blender NIF Scripts 2.5.2 (running on Blender 249, PyFFI 2.1.3)
Tracebak (most recent call last):
File "C:\Apps\Blender\.blender\scripts\bpymodules\nif_c ommon.py", line 1209, i
n gui_button_event
self.gui_exit()
File "C:\Apps\Blender\.blender\scripts\bpymodules\nif_c ommon.py", line 1558, i
n gui_exit
self.callback(**self.config)
File "C:\Apps\Blender\.blender\scripts\import\import_ni f.py", line 3742, in co
nfig_callback
importer = NifImport(**config)
File "C:\Apps\Blender\.blender\scripts\import\import_ni f.py", line 254, in __i
nit__
if root in [c for c in b.skin_instance.skeleton_root.children]:
AttributeError: 'NoneType' object has no attribute 'children'

AYUDA PORFA!!