Ajax Toolkit does not appear correctly.

i am new in asp.net and i am working on the thing where i had to add HTML Editor(Ajax Toolkit). but it does not appear correctly. Click [here] (http://s24.postimg.org/56f3vdv0l/error.png)! I used this code...--><form id="form1" runat="server"><asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager><div><cc1:Editor ID="Editor1" runat="server" width="600px" Height="200px"/><asp:Button ID="Button1" runat="server" Text="Submit" onclick="Button1_Click" /><br/><br/><asp:Label ID="Label1" runat="server"
        Text=""></asp:Label></div></form>
IT gives below output