Hi,

I have a webservice that creates users for me using a pre-existing database. I can create the users and everything is fine. When I connect to Umbraco (using a user account that wasn't created by my program), I can see all of my users. But when I try to log in with one of the account I created, it gives me this error (and doesn't connect).

    System.ArgumentOutOfRangeException: Index and length must refer to a location within the string. Parameter name: length 


Stacktrace 
at System.String.Substring(Int32 startIndex, Int32 length)
   at Umbraco.Core.Security.MembershipProviderBase.StoredPassword(String storedString, String& salt)
   at Umbraco.Core.Security.MembershipProviderBase.CheckPassword(String password, String dbPassword)
   at Umbraco.Core.Security.MembershipPasswordHasher.VerifyHashedPassword(String hashedPassword, String providedPassword)
   at Microsoft.AspNet.Identity.UserManager`2.<VerifyPasswordAsync>d__3e.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNet.Identity.UserManager`2.<CheckPasswordAsync>d__17.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Umbraco.Core.Security.BackOfficeUserManager`1.<CheckPasswordAsync>d__2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Umbraco.Core.Security.BackOfficeSignInManager.<PasswordSignInAsyncImpl>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Umbraco.Core.Security.BackOfficeSignInManager.<PasswordSignInAsync>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Umbraco.Web.Editors.AuthenticationController.<PostLogin>d__f.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Threading.Tasks.TaskHelpersExtensions.<CastToObject>d__3`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Filters.ActionFilterAttribute.<CallOnActionExecutedAsync>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Web.Http.Filters.ActionFilterAttribute.<CallOnActionExecutedAsync>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Filters.ActionFilterAttribute.<ExecuteActionFilterAsyncCore>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Filters.ActionFilterAttribute.<CallOnActionExecutedAsync>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Web.Http.Filters.ActionFilterAttribute.<CallOnActionExecutedAsync>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Filters.ActionFilterAttribute.<ExecuteActionFilterAsyncCore>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()

I think the problem is because of the password, but I've tried with numerous password lengh, and it doesn't change anything. No special characters either.

Here's the code I've used :

 public string CreateAppUser(int id, string networkUserAccess, string firstName, string lastName, string password, bool isAdmin)
        {
            Umbraco.Core.Services.IUserService UserService = ApplicationContext.Current.Services.UserService;
            //generate a temporary email
            string emailAddress = string.Format("{0}.{1}@temporary.com", firstName, lastName);
            try
            {
                if (UserService.GetByEmail(emailAddress) == null)
                {
                    //creer le user
                    IUser newUser = UserService.CreateWithIdentity(networkUserAccess,
                        string.Format("{0}.{1}@temporary.com", firstName, lastName),
                        password, (isAdmin) ? "admin" : "editor");
                    //change parameters
                    newUser.Id = id;
                    UserService.Save(newUser);
                    return string.Format("User {0} successfuly created", newUser.Name);
                }
                return "The user's email (ID " + id + ") was already taken. The user hasn't been created";
            }
            catch (Exception ex)
            {
                return "The user (ID " + id + ") couldn't be created : " + ex.Message;
            }
        }

Does anyone know what the problem is?