I cant create the sandboxscene. I got that error message: Save SceneTemplate has failed. Asset path error: ‘CollaborativeSandbox.unity’ is not valid: Incorrect extension. Required extension is: ‘.scenetemplate’.
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)
What am I doing wrong?
by user 363762600812609536
Hi, it’s a bug in Unity’s latest editor versions. Since 2021.3.28f1 - you might want to use another (previous) editor version. We reported the bug and it’s fixed but not yet released by Unity (nothing else we can do about that unfortunately)
Alternatively you can install our samples and use any of the sample scenes as a starter
or create a new empty scene and then run the Setup Scene menu item
install samples via this menu item for example
Which Unity version are you currently using?
I think it’s in all latest Editors unfortunately. I recently tried 3.29f1 but that still has the error
2021.3.28f1
by user 363762600812609536
Ok - either try the options above or install 27f1 
whatever works best for you
Ok then I roll back first! Thanks for your fast support!
by user 363762600812609536