gridview Sorting error came

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ASP.NET

while clicking on header of shorting the error came of - The GridView 'GridView1' fired event Sorting which wasn't handled.

<asp:GridView ID="GridView1" runat="server" AllowPaging="True"
                                AllowSorting="True" SupportsCallback="True"  AutoGenerateColumns="False" AutoGenerateSelectButton="True"
                                EnableModelValidation="True" Height="124px"
                                onpageindexchanging="GridView1_PageIndexChanging" Width="1069px">
                                <Columns>
                                    <asp:BoundField DataField="AccountNo" HeaderText="Account No" SortExpression="AccountNo">
                                    <HeaderStyle HorizontalAlign="Left" />
                                    </asp:BoundField>
                                    <asp:BoundField DataField="DepositType" HeaderText="Deposit Type" SortExpression="DepositType">
                                    <HeaderStyle HorizontalAlign="Left" />
                                    </asp:BoundField>
                                    <asp:BoundField DataField="AccountType" HeaderText="Account Type" SortExpression="AccountType">
                                    <HeaderStyle HorizontalAlign="Left" />
                                    </asp:BoundField>
                                    <asp:BoundField DataField="InterestRate" HeaderText="Interest Rate" SortExpression="InterestRate">
                                    <HeaderStyle HorizontalAlign="Left" />
                                    </asp:BoundField>
                                    <asp:BoundField DataField="OpenedDate" HeaderText="A/C Opened Date" SortExpression="OpenedDate">
                                    <HeaderStyle HorizontalAlign="Left" />
                                    </asp:BoundField>
                                    <asp:BoundField DataField="MaturityDate" HeaderText="Maturity Date" SortExpression="MaturityDate">
                                    <HeaderStyle HorizontalAlign="Left" />
                                    </asp:BoundField>
                                    <asp:BoundField DataField="Status" HeaderText="Status" SortExpression="Status">
                                    <HeaderStyle HorizontalAlign="Left" />
                                    </asp:BoundField>
                                </Columns>
                            </asp:GridView>