I get errors when trying to use sorting and cant figure out why
any one how can help? Thanks in advance 
when ever I try to us sorting in my datagrid i get these errors:
2022-09-06 10:06:55.453 [WRN] Unhandled exception rendering component: "Enum type 'Operations' not found"
Enum type 'Operations' not found (at index 18)
2022-09-06 10:06:55.455 [ERR] Unhandled exception in circuit '"IP5eLUyxbDXB0v5oP265lvL23znUURMvW7BL1Och6Vg"'.
Enum type 'Operations' not found (at index 18)
2022-09-06 10:06:55.489 [WRN] Unhandled exception rendering component: "Cannot access a disposed object."
System.ObjectDisposedException: Cannot access a disposed object.
at Microsoft.AspNetCore.Components.RenderTree.ArrayBuilder`1.ThrowObjectDisposedException()
at Microsoft.AspNetCore.Components.RenderTree.ArrayBuilder`1.GrowBuffer(Int32 desiredCapacity)
at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForFramesWithSameSequence(DiffContext& diffContext, Int32 oldFrameIndex, Int32 newFrameIndex)
at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForRange(DiffContext& diffContext, Int32 oldStartIndex, Int32 oldEndIndexExcl, Int32 newStartIndex, Int32 newEndIndexExcl)
at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.ComputeDiff(Renderer renderer, RenderBatchBuilder batchBuilder, Int32 componentId, ArrayRange`1 oldTree, ArrayRange`1 newTree)
at Microsoft.AspNetCore.Components.Rendering.ComponentState.RenderIntoBatch(RenderBatchBuilder batchBuilder, RenderFragment renderFragment, Exception& renderFragmentException)
at Microsoft.AspNetCore.Components.RenderTree.Renderer.ProcessRenderQueue()
2022-09-06 10:06:55.497 [ERR] Unhandled exception in circuit '"IP5eLUyxbDXB0v5oP265lvL23znUURMvW7BL1Och6Vg"'.
System.ObjectDisposedException: Cannot access a disposed object.
at Microsoft.AspNetCore.Components.RenderTree.ArrayBuilder`1.ThrowObjectDisposedException()
at Microsoft.AspNetCore.Components.RenderTree.ArrayBuilder`1.GrowBuffer(Int32 desiredCapacity)
at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForFramesWithSameSequence(DiffContext& diffContext, Int32 oldFrameIndex, Int32 newFrameIndex)
at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForRange(DiffContext& diffContext, Int32 oldStartIndex, Int32 oldEndIndexExcl, Int32 newStartIndex, Int32 newEndIndexExcl)
at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.ComputeDiff(Renderer renderer, RenderBatchBuilder batchBuilder, Int32 componentId, ArrayRange`1 oldTree, ArrayRange`1 newTree)
at Microsoft.AspNetCore.Components.Rendering.ComponentState.RenderIntoBatch(RenderBatchBuilder batchBuilder, RenderFragment renderFragment, Exception& renderFragmentException)
at Microsoft.AspNetCore.Components.RenderTree.Renderer.ProcessRenderQueue()
and the code looks like this:
<RadzenDataGrid AllowMultiColumnSorting="true" ShowMultiColumnSortingIndex="true" AllowPaging="true" AllowSorting="true" PageSize="10"
AllowFiltering="true" AllowColumnResize="true" FilterMode="FilterMode.Advanced"
@ref="operationsGrid" EditMode="DataGridEditMode.Multiple" Data="@operations" TItem="@UiOperationListVm" RowUpdate="@OnUpdateOperationRow" RowCreate="@OnCreateRowOperation"
>
<Columns>
<RadzenDataGridColumn TItem="UiOperationListVm" Property="Operation.Id" Title="ID" Sortable="false" Filterable="false" />
<RadzenDataGridColumn TItem="UiOperationListVm" Property="Operations.Name" Title="Name">
<EditTemplate Context="selectedOperation">
<RadzenNumeric @bind-Value="selectedOperation.Name" Style="width:100%; display: block;" />
</EditTemplate>
</RadzenDataGridColumn>
<RadzenDataGridColumn TItem="UiOperationListVm" Property="Operations.Description" Title="Description">
<EditTemplate Context="selectedOperation">
<RadzenTextBox @bind-Value="selectedOperation.Description" Style="width:100%; display: block;" />
</EditTemplate>
</RadzenDataGridColumn>
<RadzenDataGridColumn TItem="UiOperationListVm" Property="Operations.OperationType.Description" Title="OperationType" Width="280px" Sortable="false" Filterable="false">
<EditTemplate Context="selectedOperation">
<RadzenDropDown @bind-Value="selectedOperation.OperationTypeName" Data="@operationTypeListVm" TextProperty="Description" ValueProperty="Name" Style="width:100%; display: block;" />
</EditTemplate>
</RadzenDataGridColumn>
<RadzenDataGridColumn TItem="UiOperationListVm" Context="uiUpdateOperation" Filterable="false" Sortable="false" TextAlign="TextAlign.Center" Width="120px">
<Template Context="selectedOperation">
<RadzenButton Icon="edit" ButtonStyle="ButtonStyle.Light" Class="m-1" Click="@(args => EditOperationRow(selectedOperation))" @onclick:stopPropagation="true">
</RadzenButton>
</Template>
<EditTemplate Context="selectedOperation">
<RadzenButton Icon="check" ButtonStyle="ButtonStyle.Primary" Class="m-1" Click="@((args) => UpdatedOperationRow(selectedOperation))">
</RadzenButton>
<RadzenButton Icon="close" ButtonStyle="ButtonStyle.Light" Class="m-1" Click="@((args) => CancelOperationEdit(selectedOperation))">
</RadzenButton>
</EditTemplate>
</RadzenDataGridColumn>
<RadzenDataGridColumn TItem="UiOperationListVm" Context="uiUpdateOperation" Filterable="false" Sortable="false" TextAlign="TextAlign.Center" Width="60px">
<Template Context="selectedOperation">
<RadzenButton ButtonStyle="ButtonStyle.Danger" Icon="delete" Size="ButtonSize.Small" Class="m-1" Click="@(args => DeleteOperationRow(selectedOperation))" @onclick:stopPropagation="true">
</RadzenButton>
</Template>
<EditTemplate Context="selectedOperation">
<RadzenButton ButtonStyle="ButtonStyle.Danger" Icon="delete" Size="ButtonSize.Small" Class="m-1" Click="@(args => DeleteOperationRow(selectedOperation))">
</RadzenButton>
</EditTemplate>
</RadzenDataGridColumn>
</Columns>
</RadzenDataGrid>