UserManager's Create, CreateAsync and FindAsync methods giving "Incorrect number of arguments for call to method Boolean Equals(...)"

Question

I've made custom User and UserStore classes.
Now I'm trying to register or login with a user, but I get the error
'Incorrect number of arguments supplied for call to method Boolean Equals(System.String, System.String, System.StringComparison)'
The error is on line 411:
Line 409: }
Line 410: var user = new User() { UserName = model.Email, Email = model.Email };
--> Line 411: IdentityResult result = await UserManager.CreateAsync(user);
Line 412: if (result.Succeeded)
Line 413: {
The problem is that I can't really debug UserManager's methods, because it is in a closed DLL.
I get this same error on
UserManager.FindAsync(user), UserManager.CreateAsync(user,password), UserManager.Create(User user)
Now the error doesn't occur when I log in with an External Login, like Google, which also uses methods from UserManager. Entering the email works
as well, but when the user has to be created from an External Login with the inserted email, it gives the CreateAsync error
too.
How can I fix this? Do I need to create my own UserManager? Or do I need another solution entirely?
Packages (relevant):
package id="Microsoft.AspNet.Mvc" version="5.1.2"
id="Microsoft.Owin" version="2.1.0"
id="Microsoft.AspNet.Identity.Core" version="2.0.1"
UserStore.cs
public class UserStore :
IUserStore<User, int>,
IUserPasswordStore<User, int>,
IUserSecurityStampStore<User, int>,
IUserEmailStore<User, int>,
IUserLoginStore<User, int>
private readonly NFCMSDbContext _db;
public UserStore(NFCMSDbContext db)
_db = db;
public UserStore()
_db = new NFCMSDbContext();
#region IUserStore
public Task CreateAsync(User user)
if (user == null)
throw new ArgumentNullException("user");
_db.Users.Add(user);
_db.Configuration.ValidateOnSaveEnabled = false;
return _db.SaveChangesAsync();
public Task DeleteAsync(User user)
if (user == null)
throw new ArgumentNullException("user");
_db.Users.Remove(user);
_db.Configuration.ValidateOnSaveEnabled = false;
return _db.SaveChangesAsync();
public Task<User> FindByIdAsync(int userId = 0)
int userid;
if (userId == 0)
throw new ArgumentNullException("userId");
return _db.Users.Where(u => u.UserId == userId).FirstOrDefaultAsync();
User.cs
public class User : IUser<int>
public User()
UserLogins = new List<UserLogin>();
public int UserId { get; set; }
public string UserName { get; set; }
public string PasswordHash { get; set; }
public string SecurityStamp { get; set; }
public string Email {get; set; }
public bool IsEmailConfirmed { get; set; }
int IUser<int>.Id
get { return UserId; }
public ICollection<UserLogin> UserLogins { get; private set; }
public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<User, int> manager)
// Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
// Add custom user claims here
return userIdentity;
Startup.Auth.cs
public partial class Startup
// For more information on configuring authentication, please visit http://go.microsoft.com/fwlink/?LinkId=301864
public void ConfigureAuth(IAppBuilder app)
// Configure the db context and user manager to use a single instance per request
app.CreatePerOwinContext(NFCMSDbContext.Create);
app.CreatePerOwinContext<ApplicationUserManager>(ApplicationUserManager.Create);
// Enable the application to use a cookie to store information for the signed in user
// and to use a cookie to temporarily store information about a user logging in with a third party login provider
// Configure the sign in cookie
app.UseCookieAuthentication(new CookieAuthenticationOptions
AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,
LoginPath = new PathString("/Account/Login"),
Provider = new CookieAuthenticationProvider
OnValidateIdentity = SecurityStampValidator.OnValidateIdentity<ApplicationUserManager, User, int>(
validateInterval: TimeSpan.FromMinutes(20),
regenerateIdentityCallback: (manager, user) => user.GenerateUserIdentityAsync(manager),
getUserIdCallback: (id) => (Int32.Parse(id.GetUserId())))
// Use a cookie to temporarily store information about a user logging in with a third party login provider
app.UseExternalSignInCookie(DefaultAuthenticationTypes.ExternalCookie); (...)
Any help or ideas are greatly appreciated!
Kind regards,
Nils

Answer 1

Hi,
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