Nop.Web.Framework.UI.Captcha;

Thank you for your work.

I am try to upgrade in 3.60 but i have a error.

Compilation Error

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.
Compiler Error Message: CS0234: The type or namespace name 'Captcha' does not exist in the namespace 'Nop.Web.Framework.UI' (are you missing an assembly reference?)
Source Error:
Line 28:     using Nop.Web.Framework;
Line 29:     using Nop.Web.Framework.UI;
Line 30:     using Nop.Web.Framework.UI.Captcha;
Line 31:    
Line 32:    
Source File: c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\b4688d06\d81be114\App_Web_index.cshtml.247dde06.sxyof50v.0.cs    Line: 30

Please any idea how to resolve?

Thank you in advance.