validator error at design time

I have problem with my web form login

<div>
            <h1>Konsole - Login</h1>
            UserID : <asp:TextBox ID="tb_uid" runat="server" autoComplete="off"></asp:TextBox>
            Password :<asp:TextBox ID="tb_pass" runat="server" autoComplete="off"></asp:TextBox>
            <asp:Button ID="btn_submit" runat="server" Text="SignIN" />
            <br />
            <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" Display="Dynamic" ControlToValidate="tb_uid" ErrorMessage="RequiredFieldValidator"></asp:RequiredFieldValidator>
        </div>

design code is above and following error occured

"WebForms UnobtrusiveValidationMode requires a ScriptResourceMapping for 'jquery'. Please add a ScriptResourceMapping named jquery(case-sensitive).

"

please give solution for this problem???