Python: Traceback (most recent call last):
File "C:\Users\dingdong\AppData\Roaming\Blender Foundation\Blender\3.0\scripts\addons\io_scene_valvesource\datamodel.py", line 319, in __getitem__
return super().__getitem__(item)
KeyError: 'skeleton'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "C:\Users\dingdong\AppData\Roaming\Blender Foundation\Blender\3.0\scripts\addons\io_scene_valvesource\import_smd.py", line 77, in execute
self.num_files_imported = self.readDMX(filepath, self.properties.upAxis, self.properties.rotMode)
File "C:\Users\dingdong\AppData\Roaming\Blender Foundation\Blender\3.0\scripts\addons\io_scene_valvesource\import_smd.py", line 1288, in readDMX
DmeModel = dm.root["skeleton"]
File "C:\Users\dingdong\AppData\Roaming\Blender Foundation\Blender\3.0\scripts\addons\io_scene_valvesource\datamodel.py", line 321, in __getitem__
raise AttributeError("No attribute \"{}\" on {}".format(item,self)) from e
io_scene_valvesource.datamodel.AttributeError: 'Invalid DMX file: No attribute "skeleton" on <Datamodel element "session" (DmElement)>'

location: <unknown location>:-1

Been trying to load DMX files into Blender in order to convert them to stl files for 3d printing. I've tried this after a full re-install of Blender, full re-install of the pack, clearing my original settings/preference in appdata, and a reboot several times on Blender.

Also did this with two models and got the same error, so it's gotta be something related to DMX files as a whole, and not just one specific file.