Adding Bundles to existing ASP.NET Webforms solution
Simple solution, I had some typing errors.
In the Site.Master I missed the 's' from the end of bundles. Making my Site.Master look like this.
<head runat="server"> <asp:PlaceHolder runat="server"> <%: Scripts.Render("~/bundles/GlobalHead") %> <%: Styles.Render("~/Content/Global") %> </asp:PlaceHolder></head><body> <%: Scripts.Render("~/bundles/Global") %></body>