Resolved UIToolkit + DOTS working versions

uitoolkit bros
what version of unity and what package versions do you use?
latest working is something like 2020.2.0b13 / 2020.1.17f1
anything later throws the subscene header error it seems.

 

I'm now on Unity 2020.3.12f1 and UI Toolkit and Builder 1.0.0-preview.16 and it seems to work just fine. But I have my GUI doc on the main scene if that matters.

 

hmmm..
i tried 2020.3.16 and it didn't work.
do you use subscenes?
did you not upgrade to latest LTS because it stops working for you or because you just didn't get around to it?

 

I don't use them, but a quick test shows no errors. The only error I get is from new input system and UI Toolkit

EDIT and I didn't update because I didn't get around to it yet.

 

oh man, you're right. so its UIToolkit + Subscenes + Input that causes the bug.
wish i knew this allot earlier. I was using a specific alpha 2021.2 version that worked with dots and had the built in uitoolkit. barely worked

 

I found out that UIToolkit is incompatible with the new input system:
https://docs.unity3d.com/Manual/UI-system-compare.html#events

 

that is so weird
having a field of type UIDocument in your class also causes the issue.
so fix is no input system and casting to monobehaviour when storing in fields

 

I have no issue with InputSystem, it's just the runtime package of UIToolkit that breaks subscenes.

 

you can use both uitoolkit and subscenes it turns out. but not also with the new input system.

 

In my case UIToolkit had calls to old Input System and that was an error as I had only new input configured in player settings.