The method or operation is not implemented. I need some help solving this one. I don't understand it. This is a MVC 5.0 WebSite that I am trying to finish up.

Server Error in '/' Application.

The method or operation is not implemented.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NotImplementedException: The method or operation is not implemented.

Source Error:

Line 91:
Line 92: {
Line 93: throw new NotImplementedException();
Line 94: }
Line 95: }

Source File: C:\VisualStudio_WorkFolder\WebApplication2\WebApplication2\App_Start\IdentityConfig.cs Line: 93

Stack Trace:

[NotImplementedException: The method or operation is not implemented.]
WebApplication2.ApplicationUserManager.CreateAsync(Object password, ApplicationUser user) in C:\VisualStudio_WorkFolder\WebApplication2\WebApplication2\App_Start\IdentityConfig.cs:93
WebApplication2.Controllers.d__15.MoveNext() in C:\VisualStudio_WorkFolder\WebApplication2\WebApplication2\Controllers\AccountController.cs:157
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +92
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
System.Runtime.CompilerServices.TaskAwaiter.GetResult() +26
System.Threading.Tasks.TaskHelpersExtensions.ThrowIfFaulted(Task task) +42
System.Web.Mvc.Async.TaskAsyncActionDescriptor.EndExecute(IAsyncResult asyncResult) +73
System.Web.Mvc.Async.<>c__DisplayClass37.b__36(IAsyncResult asyncResult) +37
System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +27
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +58
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +68
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +34
System.Web.Mvc.Async.AsyncInvocationWithFilters.b__3d() +69
System.Web.Mvc.Async.<>c__DisplayClass46.b__3f() +230
System.Web.Mvc.Async.<>c__DisplayClass33.b__32(IAsyncResult asyncResult) +27
System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +27
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +58
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +68
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +34
System.Web.Mvc.Async.<>c__DisplayClass2b.b__1c() +42
System.Web.Mvc.Async.<>c__DisplayClass21.b__1e(IAsyncResult asyncResult) +124
System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +27
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +58
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +30
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +29
System.Web.Mvc.Controller.b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +27
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +48
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +58
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +30
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +21
System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +32
System.Web.Mvc.Controller.b__15(IAsyncResult asyncResult, Controller controller) +26
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +40
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +58
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +30
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +21
System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +29
System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +24
System.Web.Mvc.MvcHandler.b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +27
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +48
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +58
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +30
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +21
System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +29
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +23
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9744373
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.6.1073.0