“ArgumentException” errors thrown in the Console when entering Preview mode with a Toggle Button Group selected after creating a Background Position Style Field from UI Library

Unity: UI Toolkit Authoring Framework

Open

6.7.X

6.6.X

Steps to reproduce:
1. Create new Unity project using Universal 3D Template
2. Open UI Library window (right-click in Hierarchy > UI Toolkit > Standard Elements > UI Library)
3. In UI Library find “Background Position Style Field ” and double click on it to create it
4. In “Open UI stage” pop-up press “Continue” and save UXML file
5. In UI Viewport select Toggle Button Group (named “align”)
6. Press Preview button in UI Viewport window
7. Observe the Console window

Actual results: “ArgumentException: Object of type 'System.Int32' cannot be converted to type 'UnityEngine.UIElements.ToggleButtonGroupState’.” Errors are thrown in the Console window

Expected results: No errors are thrown in the Console window

Reproducible with versions: 6000.6.0a7

Can’t test with versions: 6000.6.0a6 and lower (No such feature to create UI Elements in Hierarchy window)

Tested on (OS): macOS Tahoe 26.4.1 (M1)

ArgumentException: Object of type 'System.Int32' cannot be converted to type 'UnityEngine.UIElements.ToggleButtonGroupState'.
System.RuntimeType.CheckValue (System.Object value, System.Reflection.Binder binder, System.Globalization.CultureInfo culture, System.Reflection.BindingFlags invokeAttr) (at <b3de1de343a349299daf7e70e6f0b89b>:0)
System.Reflection.RuntimeFieldInfo.SetValue (System.Object obj, System.Object val, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Globalization.CultureInfo culture) (at <b3de1de343a349299daf7e70e6f0b89b>:0)
System.Reflection.FieldInfo.SetValue (System.Object obj, System.Object value) (at <b3de1de343a349299daf7e70e6f0b89b>:0)
UnityEditor.UIElements.UxmlSerializedAttributeDescription.SetSerializedValue (System.Object uxmlSerializedData, System.Object value) (at /Users/bokken/build/output/unity/unity/Modules/UIElementsEditor/UXML/UxmlSerializer.cs:400)
Unity.UIToolkit.Editor.SetAttributeCommand.Execute () (at /Users/bokken/build/output/unity/unity/Modules/UIToolkitAuthoringEditor/Managed/Commands/SetAttributeCommand.cs:77)

“ArgumentException” errors thrown in the Console when entering Preview mode with a Toggle Button Group selected after creating a Background Position Style Field from UI Library

Unity: UI Toolkit Authoring Framework

Open

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“ArgumentException” errors thrown in the Console when entering Preview mode with a Toggle Button Group selected after creating a Background Position Style Field from UI Library

Unity: UI Toolkit Authoring Framework

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Open

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Prioritise and Follow this issue

Have a workaround or additional info about this issue?