Error renaming ASP.NET MVC project
asp.net-authentication, asp.net-mvc, asp.net-mvc-5, owin
Solution
I had this issue a few times already, so I will write down the procedure I follow also as a reminder for myself:
- Replace all of the old solution name with the new one.
- Navigate to Properties under each project and change the Assembly Name and Default Namespace fields to new solution name.
- Go to solution folder and rename all project folders with the new solution name.
- Remove all files under bin and obj folders.
- Solution will not be able to load projects. Remove all projects and add them again.
- Re-build the project.
Problem
I have copied a previous project and renamed it. Once I had successfully renamed all the name spaces and it build correctly. I got the following error when I ran the application: ``` 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. ``` I have figured out that if I comment out the first line below then the error goes away. ``` //[assembly: OwinStartupAttribute(typeof(Service_Monitor_Web_Interface.Startup))] namespace Service_Monitor_Web_Interface { public partial class Startup { public void Configuration(IAppBuilder app) { ConfigureAuth(app); } } } ``` I renamed my solution from User_Manager_Interface to Service_Monitor_Web_Interface. I cant seem to find any places with the old name, howevel in the error it mentions it.