ASP.NET 5 dependency injection service error -

playing code using new asp.net 5 in vs 2015. had code working , after adding additional code accommodate async identity components getting:

could not resolve service of type 'clientexpress.models.clientexpresscontextseeddata' parameter 'seeder' of method 'configure' on type 'clientexpress.startup'.

have second project used same startup.cs flow including context seeding class, async components , have 0 problems it.

can't see different in workflow other names of classes.

startup.cs

public void configureservices(iservicecollection services)     {         services.addmvc();         var connectionstring = configuration["data:eautoconnectionstring"];          services.addentityframework()             .addsqlserver()             .adddbcontext<clientexpresscontext>()             .adddbcontext<contactcontext>(options =>                  options.usesqlserver(connectionstring));          services.addscoped<icontactrepository, contactrepository>();          services.addtransient<clientexpresscontextseeddata>();      }        // method gets called runtime. use method configure http request pipeline.     public async void configure(iapplicationbuilder app, clientexpresscontextseeddata seeder)     {         app.usestaticfiles();          //app.useidentity();          app.usemvc(config =>             {                 config.maproute(                     name: "default",                     template: "{controller}/{action}/{id?}",                     defaults: new { controller = "app", action = "index" }                     );             });          await seeder.ensureseeddataasync();        } 

clientexpresscontextseeddata.cs

public class clientexpresscontextseeddata {     private clientexpresscontext _context;     private usermanager<clientexpressuser> _usermanager;      public clientexpresscontextseeddata(clientexpresscontext context, usermanager<clientexpressuser> usermanager)     {         _context = context;         _usermanager = usermanager;     }      /// <summary>     ///      /// </summary>     /// <returns></returns>     public async task ensureseeddataasync()     {           if(await _usermanager.findbyemailasync("abc@testcompany.com") == null)         {             //add initial users             var newuser = new clientexpressuser()             {                 username = "newuser",                 email = "abc@testcompany.com"             };              await _usermanager.createasync(newuser, "pa$$w0rd");         }        }  } 

if remove clienexpresscontextseeddata seeder configure method, runs of course no seeding happens.
info have found has problem showing lot when repositories used interchangeably services accidentally isn't case in situation. @ loss different or injection wrong.

clientexpresscontextseeddata depends on usermanager<clientexpressuser>

usermanager<clientexpressuser> not setup in configureservices method , therefor clientexpresscontextseeddata can't resolved.

add like:

services.addidentity<clientexpressuser, identityrole>()