'bootstrap' is not a valid script name. The name must end in '.js'.

Hi, I try to manually install bootstrap. In my site.master I have added bootstrap script reference
<asp:ScriptManager runat="server"> <Scripts> <%--Framework scripts--%> <asp:ScriptReference Name="bootstrap" /> </Scripts> </asp:ScriptManager> Then, in my scripts folder I have added these 2 files.
bootstrap.js and bootstrap-min.js
Then, in my content folder, I have added these 2 files.
bootstrap.css and bootstrap-min.css
But, when I run it, I got error: 'bootstrap' is not a valid script name.  The name must end in '.js'.
Any ideas ?