Server Error in '/' Application.

Parser Error

Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately.

Parser Error Message: Unknown server tag 'asp:ToolkitScriptManager'.

Source Error:


Line 4:  <asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
Line 5:     
Line 6:       <asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
Line 7:      </asp:ToolkitScriptManager>
Line 8:  

Source File: /WaterHeater.aspx    Line: 6


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4682.0