XLS0503 a value of type 'geometrymodel3d' cannot be added to a collection or dictionary of type 'uielementcollection'

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Why am i getting this error? This is code from the microsoft website:

XAML

<GeometryModel3D>
            <GeometryModel3D.Geometry>
                <MeshGeometry3D 
              Positions="-1 -1 0  1 -1 0  -1 1 0  1 1 0"
              Normals="0 0 1  0 0 1  0 0 1  0 0 1"
              TextureCoordinates="0 1  1 1  0 0  1 0   "
              TriangleIndices="0 1 2  1 3 2" />
            </GeometryModel3D.Geometry>
            <GeometryModel3D.Material>
                <DiffuseMaterial>
                    <DiffuseMaterial.Brush>
                        <SolidColorBrush Color="Cyan" Opacity="0.3"/>
                    </DiffuseMaterial.Brush>
                </DiffuseMaterial>
            </GeometryModel3D.Material>
            <!-- Translate the plane. -->
            <GeometryModel3D.Transform>
                <TranslateTransform3D
            OffsetX="2" OffsetY="0" OffsetZ="-1"   >
                </TranslateTransform3D>
            </GeometryModel3D.Transform>
        </GeometryModel3D>

What I have tried:

well some random other things like adding some dlls and none worked.

Posted 13-Jun-21 15:33pm

A-Games

Updated 14-Jun-21 3:55am

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Richard Deeming · Accepted Answer · 2021-06-14T03:55:00

Because you're adding the GeometryModel3D element at the wrong place in your markup.

We can't tell you precisely where, because you forgot to include the parent element. According to the documentation, it looks like it needs to be inside a ModelVisual3D/ModelVisual3D.Content element:
How to: Create a 3D Scene - WPF .NET Framework | Microsoft Docs[^]

XAML

<ModelVisual3D>
    <ModelVisual3D.Content>
        <GeometryModel3D>