Bug Error on Fresh Project w/ UI Toolkit 2021.1.10.2062

1 - Create New 2d Project
2 - Install UI Toolkit Version 1.0.0-preview.14
3 - Create A new UI Document, TSS file or Theme
4 - Click the new asset, the following 5 errors appear in the console:

[Worker0] Assertion failed on expression: 'state.state == kUpToDate'
[Worker0] Assertion failed on expression: 'state.artifactID == result'
[Worker0] Assertion failed on expression: 'ins.second || ins.first->second == artifactID || (ins.first->second == CircularDependencyArtifactID() && !artifactID.IsValid()) || GetPathFromAssetGuidV2(key.GetGUID()).ends_with(".cs")'
[Worker0] Assertion failed on expression: 'state.state == kUpToDate'
[Worker0] Assertion failed on expression: 'state.artifactID == result'​

This happens for each individual asset the first time you select it, then if you reload, change it, or start/stop the editor the error will happen again.

I really liked how my prototype worked in 2021.2 with UI Toolkit, so I thought I'd move down to 2021.1 which I assume will have a release soon to start working on the actual game.
I can't seem to get a bare 2021.1 project to run UI Toolkit without errors, I wanted to get the latest UI Builder as well so I could use text shadow (which doesn't seem to be available right now in 2021.2)

I can't find this error mentioned anywhere, is it possible I'm doing something wrong?
Edit: I have already filed a bug report in Unity, it would just be neat if anybody knew a solution, it just fills my error console, everything still works as I understand it but I just can't really use the console for errors since they get bumped

 

I also have this issue in 2021.1.0b11 (but it's been there for couple of versions now).

Also, after some editor update (not remember which version exact, though I guess it was the version which should had included UI Toolkit directly), the UI Toolkit was not functional. The UI Builder worked, but PanelSettings as well as font settings asset both had "missing scripts". I fixed it by manually adding com.unity.ui via package manager, which you stated should not be needed.
However, the errors remained, as well as constant "Invalid value for font MissingAssetReference" console spam and broken UI Documents (missing sprites & fonts, broken layouts, etc.)

How would we go about installing the package from scratch? Would that solve the issue?

 

Second this, need package for 2021.1.0b11 and can't debug the project anymore with Rider and the asserts popping up.

 

Are you referring to the "[Worker0] Assertion failed" errors?

Is it possible that UI Documents became corrupted during one of the version upgrades? Couple of versions ago I made some UI Documents but stopped working on them because of constant console errors, I wanted to wait for newer version.

I upgraded to 2021.1.0b12 and UI Tookit preview.14 and UI Builder preview.13 and all the errors are still present. On top of that, my old documents have unfixable font and sprite references. The whole builder seems very buggy, not sure what is causing this.

1) I cannot update fonts
- I get constant "invalid font" errors in console
- There are two font references in Text options. "Font", and "Font Asset".
Trying to set Font results in "IndexOutOfRangeException: Index was outside the bounds of the array." console error.
Setting Font Asset errors in "Invalid value for font MissingAssetReference" and various fonts display different text results.
Or sometimes I see this error: "Cannot create a FontDefinition, the type must be FontAsset"

2) Cannot update sprites
When I open my old documents, I get green triangle warnings in the layout that a sprite is missing. However I can't set a new sprite. Some sprites work, others result in warnings and yellow triangles. "Image not found for path: Icons/Bolt_00" - but the file exists and is a valid sprite. I am choosing it via the UI Biulder's picker ...

3) UI Builder asks if I want to save the document not when closing the window, but when opening another document. Even if it's a different document, the builder comes up with a question to save work on the previous document.

This seems like some kind of corruption or perhaps underlying conflict in packages? Does not seem like "preview" version.

 

Just upgraded my existing 2D project from 2020.2.6f1 to 2021.1.0f1 and I'm seeing the same "[Worker0] Assertion failed" errors. Already had UI Toolkit preview-14 installed.

When I purged the Library folder, the error did not appear on next start-up, but promptly re-appeared after starting and exiting playmode on an empty scene.

--

Upon some further testing, I abandoned the branch, and ran through the upgrade process again. It seems like the errors appear when opening any folder in the project view which contains either uxml or uss files. They only appear once per application reload (after entering playmode/recompiling).

Uninstalling the UIToolkit package and restarting Unity stops the errors - but then I cannot use any of the runtime features

Is there a bug tracker link for this that I could follow?

 

Got the same error in Unity 2021.1.0f1.

For me it pops up everytime I select a .uss or .uxml file in the Project panel after it has been reimported or after changing code and the editor refreshes but only if the Inspector panel is visible.
So right clicking on a .uss or .uxml file and pressing reimport while Inspector is visible, will always throw the error.
The error never shows up when the Inspector panel is closed or hidden.

Right now I just avoid selecting .uss or .uxml files in the Project panel when I don't need them or hide the Inspector while I don't need it.

 

That's great to hear, thanks. How do I use that bug ID? I couldn't find a way to use it on the issue tracker or fogbugz - is there another bug tracker?

 

Well it looks like the freshly released 2021.1.1f1 resolved... one out of 3 errors?

 

I've got the same issue. Just updated to 2021.1.1f1. Can also confirm that it fixed one of the 3 errors.
I'm getting these errors repeatedly 12 times(24 errors in total) once I open and close an uxml file with the UI Builder.
I'm guessing that the repeating is caused by me having 6 uxml files in the same directory but I'm not sure.

 

Same errors on the latest released version of Unity 2021.1.5f1.

 

Same errors on the lates released version of Unity 2021.1.7f1

They only appear after I enter and exit Play Mode for the first time.

 

Restarting the editor seems to fix the problem only for my case, it might not be for yours. It would always happen when a certain prefab was open and selected in the project and you just exit play mode.

Edit: it still keeps happening occasionally (2021.1.15f1).

 

Any news on this?

Code (CSharp):

1. [Worker0] Assertion failed on expression: 'state.state == kUpToDate'
2. [Worker0] Assertion failed on expression: 'state.artifactID == result'
3. [Worker0] Assertion failed on expression: 'state.state == kUpToDate'
4. [Worker0] Assertion failed on expression: 'state.artifactID == result'

It's annoying that one can get bugs like these on a new project.
Looks like this has been a bug for at least 4 months... can we get this resolved?
It's not exactly encouraging when you try out a new package, just to immediately get errors...

UI Toolkit: Version 1.0.0-preview.14
2021.1.12f1

 

I also get these errors after updating to 1.0.0-preview.15 in 2021.1.15f.

Any news on if this will be fixed?

 

Same issue as magnetic_scho while using the same versions.

 

install com.unity.ui.builder by name, and make sure both are on the same preview version (e.g. preview.15 for the latest)

I think the problem is that unity preview ships with a builder installed internally, which is compatible with preview.14. After updating toolkit to a different version the builder shiped won't be supported anymore

 

I am getting these same errors on version Preview 16. It removes my ability to change the text on any of the elements, because above the Stylesheet drop down there's a dropdown called "Attributes" which has nothing. On Unity version 2021.1.17f1, all freshly installed today.

 

@Daxten Which
Unity version are you referring to?
Can you post the Ui Toolkit/UI Builder entries out of manifest.json?

 

I am seeing the same errors with Preview 16 on 2021.1.16f1, upgraded today from Preview 15. I was having them on 15 as well. Reproducible by showing a folder containing uxml, uss and PanelSettings.asset files after exiting playmode, or entering playmode with such a folder selected.

Incidentally that upgrade also made all of my TextField elements un-writable??? *edit* the TextField issue seems to have been fixed by an upgrade to 2021.1.17f1.

Code (csharp):

1. {
2.   "dependencies": {
3.     "com.unity.collab-proxy": "1.7.1",
4.     "com.unity.ide.rider": "3.0.7",
5.     "com.unity.ide.visualstudio": "2.0.9",
6.     "com.unity.ide.vscode": "1.2.3",
7.     "com.unity.test-framework": "1.1.27",
8.     "com.unity.textmeshpro": "3.0.6",
9.     "com.unity.timeline": "1.5.6",
10.     "com.unity.ugui": "1.0.0",
11.     "com.unity.ui": "1.0.0-preview.16",
12.     "com.unity.ui.builder": "1.0.0-preview.16",
13.     "com.unity.visualscripting": "1.6.1",
14.     "com.unity.modules.ai": "1.0.0",
15.     "com.unity.modules.androidjni": "1.0.0",
16.     "com.unity.modules.animation": "1.0.0",
17.     "com.unity.modules.assetbundle": "1.0.0",
18.     "com.unity.modules.audio": "1.0.0",
19.     "com.unity.modules.cloth": "1.0.0",
20.     "com.unity.modules.director": "1.0.0",
21.     "com.unity.modules.imageconversion": "1.0.0",
22.     "com.unity.modules.imgui": "1.0.0",
23.     "com.unity.modules.jsonserialize": "1.0.0",
24.     "com.unity.modules.particlesystem": "1.0.0",
25.     "com.unity.modules.physics": "1.0.0",
26.     "com.unity.modules.physics2d": "1.0.0",
27.     "com.unity.modules.screencapture": "1.0.0",
28.     "com.unity.modules.terrain": "1.0.0",
29.     "com.unity.modules.terrainphysics": "1.0.0",
30.     "com.unity.modules.tilemap": "1.0.0",
31.     "com.unity.modules.ui": "1.0.0",
32.     "com.unity.modules.uielements": "1.0.0",
33.     "com.unity.modules.umbra": "1.0.0",
34.     "com.unity.modules.unityanalytics": "1.0.0",
35.     "com.unity.modules.unitywebrequest": "1.0.0",
36.     "com.unity.modules.unitywebrequestassetbundle": "1.0.0",
37.     "com.unity.modules.unitywebrequestaudio": "1.0.0",
38.     "com.unity.modules.unitywebrequesttexture": "1.0.0",
39.     "com.unity.modules.unitywebrequestwww": "1.0.0",
40.     "com.unity.modules.vehicles": "1.0.0",
41.     "com.unity.modules.video": "1.0.0",
42.     "com.unity.modules.vr": "1.0.0",
43.     "com.unity.modules.wind": "1.0.0",
44.     "com.unity.modules.xr": "1.0.0"
45.   }
46. }
47.  

 

Wanted to implement UI with UIBuilder but I can't make a build with it :/ Also confirm @GoodGuyA bug that Attributes menu has nothing in it. Unity 15f1

 

I'm seeing this issue as well.

 

Today test , today show up error
[Worker4] Assertion failed on expression: 'state.state == kUpToDate'
[Worker4] Assertion failed on expression: 'state.artifactID == result'
Cannot open uxml to ui builder, but auto open to visual studio.
After install com.unity.ui.builder show like this

But, Restart unity, problem solve
Another problem, c# (window editor to create uielement) broken, cannot open (menuitem("../..")) when I click, but I delete script file and recreate(copy and paste), problem solve.

using 2021.1.20f1
UI Builder 1.0.0-preview.17
UI Toolkit 1.0.0-preview.17

but still get this
[Worker4] Assertion failed on expression: 'state.state == kUpToDate'
[Worker4] Assertion failed on expression: 'state.artifactID == result'

 

Same. Restarting the editor doesn't fix it for me. Happens when I open a UXML file in the project browser.

[Worker0] Assertion failed on expression: 'state.state == kUpToDate'

[Worker0] Assertion failed on expression: 'state.artifactID == result'

Unity 2021.1.20f1
UI Builder and UI Toolkit at 1.0.0-preview.17

 

Aww. I'm having the same issue.

1. Create a new URP project in 2021.1.21f1
2. Import the com.unity.ui package to get UI elements
3. Create a new UI document
4. Immediately errors in the console when I click on it



So I should be installing UI Builder? What's the package id for that one?

 

It's com.unity.ui.builder, but that won't solve your issue.

 

Do you mean that the UI Toolkit package assumes the UI Builder package is also present, and if not, unexpected errors might happen?

If a package requires another, it should be added as a dependency so that the package manager installs all the required packages. But if both depend on each other (circular dependency), why split into two packages?

Wouldn't it be cleaner to architect it so that UI Builder depends on UI Toolkit but not the other way around?

 

I have both packages installed with matching version, but that didn't solve the issue.

 

[Worker0] Assertion failed on expression: 'state.artifactID == result'

and 11 other assertion errors.

Fresh project, with nothing else installed besides UI Toolkit and UI Builder (both at prview.117).

Unity 2021.1.21f1, running on Linux.

 

I am getting scrambled, unreadable text in the Package Manager and any UI Toolkit asset.

This is on Mac OS Big Sur, Unity 2021.1.23 with the UI Toolkit and UI Builder preview 17 packages. I can't even work till this is readable. Solution?

 

Also, rebooting and restarting Unity had no effect. Deleting the Library, reimporting all assets had no effect.

 

I am getting the same error on start-up (Unity 2021.1.23f1). What I did: started building my UI using the built-in UI Toolkit. Realized I will need to download the package version for runtime support and downloaded that along with UI Builder.

UI Toolkit = 1.0.0 Preview 18
UI Builder = 1.0.0 Preview 17

Went to bed and woke up and started working again and upon project loading, I see these errors pop up:

 

I'm also getting the following errors at very high frequency:

• [Worker0] Assertion failed on expression: 'state.state == kUpToDate'
• [Worker0] Assertion failed on expression: 'state.artifactID == result'

And I'm getting these errors while following the standard workflow from scratch:

• Trying to read value of type Enum while reading a value of type MissingAssetReference UnityEngine.UIElements.UIElementsRuntimeUtilityNative:UpdateRuntimePanels ()
• Trying to read value of type Enum while reading a value of type MissingAssetReference
  UnityEditor.EditorApplication:Internal_CallUpdateFunctions ()
• Trying to read value of type Enum while reading a value of type MissingAssetReference
  UnityEngine.UIElements.VisualTreeStyleUpdaterTraversal:TraverseRecursive (UnityEngine.UIElements.VisualElement,int)
  Unity.UI.Builder.BuilderVisualTreeStyleUpdaterTraversal:TraverseRecursive (UnityEngine.UIElements.VisualElement,int) (at Library/PackageCache/com.unity.ui.builder@1.0.0-preview.18/Editor/Builder/Viewport/BuilderVisualTreeStyleUpdaterTraversal.cs:68)

Unity: 2021.1.23f1
UI Builder: 1.0.0-preview.18
UI Toolkit: 1.0.0-preview.18

 

Seeing this error after upgrading the project from 2019.4.38 to 2020.3.34
I have deleted Library forlder and reimported everything, but it didn't help.
I don't use any UI packages, only basic Unity UI 1.0.0
Every time i click on the new asset i haven't clicked yet in this session, a getting this:

[Worker0] Assertion failed on expression: 'state.state == kUpToDate'
[Worker0] Assertion failed on expression: 'state.artifactID == result'
[Worker0] Assertion failed on expression: 'state.state == kUpToDate'
[Worker0] Assertion failed on expression: 'state.artifactID == result'

Is there any fix for this in 2020.x? It's very annoying.

 

Same issue, my "solution" is to use Console Enhanced and tag those as "Useless Unity Errors"
which filters them out of the console. I don't even want to know why im getting this over several LTS versions (2020.3.37f1 currently) and why nobody at unity ever encountered this issue.