Error when using ASPNet Core 3

Questions
1

I am using Visual Studio 2019, created an ASPNet Core 3 application MVC. I followed the example for getting Okta setup (Okta Authentication Quickstart Guides | Okta Developer). When running the application for the first time I am getting the following error:

TypeLoadException: Could not load type 'Microsoft.AspNetCore.Authentication.Internal.RequestPathBaseCookieBuilder' from assembly 'Microsoft.AspNetCore.Authentication, Version=3.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.

Microsoft.AspNetCore.Authentication.OpenIdConnect.OpenIdConnectOptions..ctor()

I found an article similar to this issue here (openid connect - IdentityServer4 (3.0.0) exception adding OpenIdConnect - Stack Overflow). However I followed the Okta quickstart guide and I do have the relevevent .addCookie in my ConfigureServices section of Startup.cs.

2

Looking at this further, it appears that this class is not in ASPNet.

From my original error, here is the stack trace:

* ## TargetInvocationException: Exception has been thrown by the target of an invocation.

* ### System.RuntimeTypeHandle.CreateInstance(RuntimeType type, bool publicOnly, bool wrapExceptions, ref bool canBeCached, ref RuntimeMethodHandleInternal ctor, ref bool hasNoDefaultCtor)

* ### System.RuntimeType.CreateInstanceDefaultCtorSlow(bool publicOnly, bool wrapExceptions, bool fillCache)

* ### System.RuntimeType.CreateInstanceDefaultCtor(bool publicOnly, bool skipCheckThis, bool fillCache, bool wrapExceptions)

* ### System.Activator.CreateInstance<T>()

* ### Microsoft.Extensions.Options.OptionsFactory<TOptions>.Create(string name)

* ### Microsoft.Extensions.Options.OptionsMonitor<TOptions>+<>c__DisplayClass11_0.<Get>b__0()

* ### System.Lazy<T>.ViaFactory(LazyThreadSafetyMode mode)

* ### System.Lazy<T>.ExecutionAndPublication(LazyHelper executionAndPublication, bool useDefaultConstructor)

* ### System.Lazy<T>.CreateValue()

* ### System.Lazy<T>.get_Value()

* ### Microsoft.Extensions.Options.OptionsCache<TOptions>.GetOrAdd(string name, Func<TOptions> createOptions)

* ### Microsoft.Extensions.Options.OptionsMonitor<TOptions>.Get(string name)

* ### Microsoft.AspNetCore.Authentication.AuthenticationHandler<TOptions>.InitializeAsync(AuthenticationScheme scheme, HttpContext context)

* ### Microsoft.AspNetCore.Authentication.AuthenticationHandlerProvider.GetHandlerAsync(HttpContext context, string authenticationScheme)

* ### Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)

* ### Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

Here is my dotnet --info output.

C:\Windows\System32>dotnet --info
.NET Core SDK (reflecting any global.json):
 Version:   3.0.100
 Commit:    04339c3a26

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.14393
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\3.0.100\

Host (useful for support):
  Version: 3.0.0
  Commit:  7d57652f33

.NET Core SDKs installed:
  1.1.0 [C:\Program Files\dotnet\sdk]
  1.1.14 [C:\Program Files\dotnet\sdk]
  2.0.0 [C:\Program Files\dotnet\sdk]
  2.1.202 [C:\Program Files\dotnet\sdk]
  2.1.403 [C:\Program Files\dotnet\sdk]
  2.1.500 [C:\Program Files\dotnet\sdk]
  2.1.502 [C:\Program Files\dotnet\sdk]
  2.1.505 [C:\Program Files\dotnet\sdk]
  2.1.508 [C:\Program Files\dotnet\sdk]
  2.1.509 [C:\Program Files\dotnet\sdk]
  3.0.100 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:
  Microsoft.AspNetCore.All 2.1.5 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.5 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 1.0.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 1.0.16 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 1.1.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 1.1.13 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.0.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]