[Resolvido] Grid view evento botao

Olá, bom dia!!

Estou com este erro:

Compilation Error

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS1061: 'ASP.default_aspx' does not contain a definition for 'GridViewClientgroupaTTendant_RowCommand' and no extension method 'GridViewClientgroupaTTendant_RowCommand' accepting a first argument of type 'ASP.default_aspx' could be found (are you missing a using directive or an assembly reference?)

Source Error:

Line 117: <asp:TabPanel runat="server" HeaderText="Relatório de Cliente" ID="TabPanel1">

Line 118: <ContentTemplate>

Line 119: <asp:GridView ID="GridViewClientgroupaTTendant" runat="server"

MEU EVENTO LOAD DO GRID:

protected void LoadClientGroupATTendant()
{

 List<Lib.OM.Ura.ClientGroup> clienteGroupaTTendant = new List<Lib.OM.Ura.ClientGroup>();
 clienteGroupaTTendant = Lib.BLL.Ura.getClientGroupAttendant(null);
 try
 {
 if (clienteGroupaTTendant.Count > 0)
 {
 GridViewClientgroupaTTendant.DataSource = clienteGroupaTTendant;
 GridViewClientgroupaTTendant.DataBind();
 }
 }
 catch (Exception ex)
 {
 ShowAlert(ex.Message);
 }
 }

E O GRID NO ASP:

<asp:GridView ID="GridViewClientgroupaTTendant" runat="server" AutoGenerateColumns="False" BackColor="White" BorderColor="#FF6600" BorderStyle="Solid" BorderWidth="2px" CellPadding="4"
OnRowCommand="GridViewClientgroupaTTendant_RowCommand" Width="100%">

 <Columns>
 <asp:BoundField DataField="Extension" HeaderText="Ramal"
 SortExpression="Ramal" />
 <asp:BoundField DataField="Name" HeaderText="Nome Atendente"
 SortExpression="Nome Atendente" />
 <asp:TemplateField>
 <ItemStyle CssClass="text-center" Width="25px" />
 </asp:TemplateField>
 </Columns>
 <FooterStyle BackColor="#99CCCC" ForeColor="#003399" />
 <HeaderStyle BackColor="#003399" Font-Bold="True" ForeColor="#CCCCFF" />
 <PagerStyle BackColor="#99CCCC" ForeColor="#003399" HorizontalAlign="Left" />
 <RowStyle BackColor="White" ForeColor="#003399" />
 <SelectedRowStyle BackColor="#009999" Font-Bold="True" ForeColor="#CCFF99" />
 <SortedAscendingCellStyle BackColor="#EDF6F6" />
 <SortedAscendingHeaderStyle BackColor="#0D4AC4" />
 <SortedDescendingCellStyle BackColor="#D6DFDF" />
 <SortedDescendingHeaderStyle BackColor="#002876" />
 </asp:GridView>

PODE ME AJUDAR? ABS