c# - Unable to resolve service for type 'Microsoft.Owin.Security.IAuthenticationManager' while attempting to activate ApplicationSignInManager -

i'm using vnext identity 2 , error

unable resolve service type microsoft.owin.security.iauthenticationmanager

while attempting activate applicationsigninmanager.

in startup.cs have :

services.addscoped<signinmanager<applicationuser, int>, applicationsigninmanager>(); 

in applicationsigninmanager.cs class

public sealed class applicationsigninmanager : signinmanager<applicationuser, int> {        usermanager<applicationuser, int> _usermanager { get; }     signinmanager<applicationuser, int> _signinmanager { get; }      public applicationsigninmanager(usermanager<applicationuser, int> _usermanager, iauthenticationmanager authenticationmanager) : base(_usermanager, system.web.httpcontext.current.getowincontext().authentication)     {        usermanager = _usermanager;     } } 

i've tried many different approaches , can't hurdle.