Custom element not working, "has no registered factory method."

Unity Engine
1

Not sure what I’m doing wrong.

using UnityEngine;
using UnityEngine.UIElements;

public class CustomElement : VisualElement
{
    // this doesn't work either
    //public new class UxmlFactory : UxmlFactory<CustomElement, UxmlTraits> { }
    public new class UxmlFactory : UxmlFactory<CustomElement> { }
    public CustomElement()
    {
        Debug.Log(this);
    }
}

<UXML
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="UnityEngine.UIElements"
xsi:noNamespaceSchemaLocation="../UIElementsSchema/UIElements.xsd"
xsi:schemaLocation="UnityEngine.UIElements ../UIElementsSchema/UnityEngine.UIElements.xsd">

<Style src="MainMenu.uss" />
<CustomElement>
<Label text="Custom Element Label" />
</CustomElement>
</UXML>```

the error:

Element ‘UnityEngine.UIElements.CustomElement’ has no registered factory method.
UnityEngine.UIElements.UIDocument:OnEnable () (at Library/PackageCache/com.unity.ui@1.0.0-preview.14/GameObjects/UIDocument.cs:315)

2

Hello, you’ll need to put your element into a namespace.

using UnityEngine;
using UnityEngine.UIElements;

namespace Test
{
    public class CustomElement : VisualElement
    {
        public new class UxmlFactory : UxmlFactory<CustomElement, VisualElement.UxmlTraits> {}

        public CustomElement()
        {
            Debug.Log(this);
        }
    }
}

And then make sure to import this namespace in your UXML:

<?xml version="1.0" encoding="utf-8"?>

<UXML

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xmlns="UnityEngine.UIElements"
    xmlns:test="Test"
    xsi:noNamespaceSchemaLocation="../UIElementsSchema/UIElements.xsd"

    xsi:schemaLocation="UnityEngine.UIElements ../UIElementsSchema/UnityEngine.UIElements.xsd">



    <Style src="MainMenu.uss" />

    <test:CustomElement>

        <Label text="Custom Element Label" />

    </test:CustomElement>

</UXML>
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