BlendTreeWorkspace is NULL in the console window when the animator controller tab window is opened.

Unity Engine
1

I’m using unity3d editor version 2021.3.2f1 personal and suddenly now i’m getting this exception nonstop and when i click or move the mouse over the editor the exception is getting more and more in the console window.

It wasn’t 10 minutes ago and never at all and suddenly it started some few minutes ago.

I tried to google for a solution but didn’t find any yet.

BlendTreeWorkspace is NULL UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

It looks like that if i close the Animator Controller tab window the exception not show anymore but when i open the animator controller tab again the exception show again.

1116×699 109 KB

2 Likes
2

I’ve got it too.

3

I’ve got the same issue (Unity version 2021.3.4f1) . . . is this an editor bug? If so, is there any fixes yet?

4

Did you fix this error. I have this error too.

5

Restarting the editor cleared the error for me

1 Like
6

It happened to me when copying a blend tree from one animation controller to another and after opening/double-clicking the blend tree to make the edits. Found that the blend tree graph in inspector was empty. So toggled the blend type to another and back to what it was and the errors disappear.

5 Likes
7

Thank you! I have same issue on Unity version 2021.3.14f1 and your solution has fix the problem!

8

Hi all!! I’m NicoTiza (i just changed my nickname but i don’t see it already)… I just see that i have the same problem and I’m using Mixamo stuff… I see that files are read only… and one of that was wroken (I’m really new in Unity, in student state). The file wroken was “mixamo.com” animation… Just deleted them from blend tree and now the error dissapear… For some reason there was a conflict with Humanoid Clips… so, i will start again and try to not get that error.

9

May be this would help

8623401--1158507--BlendTreeWorkSpace in Null.png
8623401--1158507--BlendTreeWorkSpace in Null.png446×601 34.8 KB

10

Glad it helped!

1 Like
11

Try changing the animation type in the import settings > Rig folder.

12

go in “window” then go in “Layouts” then press “Reset All Layouts”.

6 Likes
13

this helped for me by changing just the layout to my save layout

14

My repro was:

  • Delete the default Blend Parameter
  • Then save
  • See error

To fix:

  • Add back the Blend Parameter as a float
  • Delete all BlendTrees (maybe you can just delete one of them, but I deleted all)
  • Rebuild the BlendTrees
  • Save
  • Close animator window
  • Reopen animator window

Hope that helps others.