Thx for big help !
For now i did installed 2.8 version, and all works just fine. So i stick with this version for a few days, cause in very hurry need to complete few models. And after that i will try your advice , probably it will help !
Thx again !!!

Well, with blender 2.79b all working just fine. no problem at all. strange...)

after this blender update i can export but still get same error.... need to check if the exported model are ok and everything works fine...

Originally posted by Pte Jack:

Nope, not the problem, mine is exporting perfectly, both collections and suppressed.

Does folder N:\test actually exist and is it a valid mapped drive?

Another thing,

Operator bpy.ops.ed.undo.poll() failed, context is incorrect

This is a blender function, have you remapped the UnDo function somehow?

yes the drive is more than ok all is cool there.

as for operator bpy.ops.ed.undo.poll - dont know , maybe i did that, but honestly dont know, i reinstalled blender but that didnt help at all...

Originally posted by Pte Jack:

That looks like it is set up properly for SFM. Would have liked to see the actual model you were trying to export though. When exporting how many vertices and do you suppress the collections before exporting the model files?

you know, in my case it doesnt mater which model im exporting , now this happens with any model, i cant even export this default cube .... always get this error...

Originally posted by Pte Jack:

Post a picture of how you have BleST set up in Blender.

https://www.4shared.com/folder/P5My8fQV/_online.html

Hi all, everything worked pretty good so far, but recently when i trying to export my models in smd or dmx with belnder source tools, i get this error, and model not exporting at all. Never had this error before... I reinstalled both blender and source tools, nothing helps, i even tried older versions of source tools, nope, same error again...
If anyone can help, please respond ! Thank you in advance !

Error description -

Traceback (most recent call last):
File "C:\Users\1\AppData\Roaming\Blender Foundation\Blender\2.83\scripts\addons\io_scene_valvesource\export_smd.py", line 248, in execute
if bpy.app.debug_value <= 1: ops.ed.undo()
File "F:\SteamLibrary\steamapps\common\Blender\2.83\scripts\modules\bpy\ops.py", line 201, in __call__
ret = op_call(self.idname_py(), None, kw)
RuntimeError: Operator bpy.ops.ed.undo.poll() failed, context is incorrect

location: <unknown location>:-1