重命名 ASP.NET MVC 项目时出错

我复制了以前的一个项目，并将其重新命名。一旦我成功地重命名了所有的名称空间，并且正确地构建了它。在运行应用程序时，我得到了以下错误:

The following errors occurred while attempting to load the app.
- The OwinStartup attribute discovered in assembly 'User Manager Interface' referencing    startup type 'User_Manager_Interface.Startup' conflicts with the attribute in assembly   'Service Monitor Web Interface' referencing startup type  'Service_Monitor_Web_Interface.Startup' because they have the same FriendlyName ''. Remove or   rename one of the attributes, or reference the desired type directly.
To disable OWIN startup discovery, add the appSetting owin:AutomaticAppStartup with a value of "false" in your web.config.
To specify the OWIN startup Assembly, Class, or Method, add the appSetting owin:AppStartup with the fully qualified startup class or configuration method name in your web.config.

我已经算出，如果我注释掉下面的第一行，那么错误就消失了。

//[assembly: OwinStartupAttribute(typeof(Service_Monitor_Web_Interface.Startup))]
namespace Service_Monitor_Web_Interface
{
public partial class Startup
{
public void Configuration(IAppBuilder app)
{
ConfigureAuth(app);
}
}
}

我将解决方案从 User _ Manager _ Interface 重命名为 Service _ Monitor _ Web _ Interface。

我似乎找不到任何地方与旧名称，无论在错误它提到它。