Hello. I've been trying to export a vrchat avatar from blender into the source engine but whatever I do. Whenever i press export this message appears in my console and idk what to do:

Python: Traceback (most recent call last):
File "C:\Users\jaime\AppData\Roaming\Blender Foundation\Blender\3.1\scripts\addons\io_scene_valvesource\export_smd.py", line 207, in execute
self.exportId(context, id)
File "C:\Users\jaime\AppData\Roaming\Blender Foundation\Blender\3.1\scripts\addons\io_scene_valvesource\export_smd.py", line 350, in exportId
bake = self.bakeObj(ob)
File "C:\Users\jaime\AppData\Roaming\Blender Foundation\Blender\3.1\scripts\addons\io_scene_valvesource\export_smd.py", line 763, in bakeObj
if con.type in ['CHILD_OF','COPY_TRANSFORMS'] and con.target.type == 'ARMATURE' and con.subtarget:
AttributeError: 'NoneType' object has no attribute 'type'

location: <unknown location>:-1

Could anyone help me out?