I can't set a Datagrid correctly

Hello !
I'm new in Blazor and Radzen, so sorry if my question is to basic.
When I want to display my datagrid I have this error in the browser dev tool :

" Error: System.NullReferenceException: Object reference not set to an instance of an object.

at Radzen.PropertyAccess.IsNumeric(Type source)

at Radzen.Blazor.RadzenDataGrid`1.BuildRenderTree(RenderTreeBuilder __builder)

at Microsoft.AspNetCore.Components.Rendering.ComponentState.RenderIntoBatch(RenderBatchBuilder batchBuilder, RenderFragment renderFragment)

at Microsoft.AspNetCore.Components.RenderTree.Renderer.RenderInExistingBatch(RenderQueueEntry renderQueueEntry)

at Microsoft.AspNetCore.Components.RenderTree.Renderer.ProcessRenderQueue() "

This the code of my datagrid :

<RadzenDataGrid Count="@count" AllowFiltering="true" AllowPaging="true" PageSize="3" AllowSorting="true"
                            Data="@commandes" TItem="Commandetest">
                    <RadzenDataGridColumn Width="200px" TItem="Commandetest" Property="id" Title="ID" />

Check if you have such property.

Thanks for the answer I found my mistake :grin: