.Net Core 2.1-Cannot access a disposed object.Object name: 'IServiceProvider' (3)

I just migrated .NET Core 2.0 to .NET Core 2.1. Everything went fine, but when I try to login now I get the folowing error:

• $exception {System.ObjectDisposedException: Cannot access a disposed object. Object name: 'IServiceProvider'.

This happens in this bit of code:

public class AppContractResolver : DefaultContractResolver

{

    private readonly IServiceProvider _services;

    public AppContractResolver(IServiceProvider services)

    {

        _services = services;

    }

    protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)

    {

        var httpContextAccessor = _services.GetService<IHttpContextAccessor>();

        var user = httpContextAccessor.HttpContext.User;

        List<JsonProperty> properies = base.CreateProperties(type, memberSerialization).ToList();

        properies = FilterOneClaimGranted(type, properies, user);

        return properies;

    }

It happens on this line:

var httpContextAccessor = _services.GetService<IHttpContextAccessor>();

This did work on .NET Core 2.0

I have tried adding the HttpContextAccessor to my startup, but that did not work.

So, how do I fix this?

Let me know if you need more code. I will happily provide more, but I don't know what you might or might not need, so therefor I did not add a lot of code.'

EDIT

I have added services.AddHttpContextAccessor(); to my startup, but that does not seem to work. Still getting the error.

EDIT 2:

Full stacktrace:

- $exception    {System.ObjectDisposedException: Cannot access a disposed object.

Object name: 'IServiceProvider'.

   at Microsoft.Extensions.DependencyInjection.ServiceLookup.ThrowHelper.ThrowObjectDisposedException()

   at Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope.GetService(Type serviceType)

   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetService[T](IServiceProvider provider)

   at WebAPI.Extensions.AppContractResolver.CreateProperties(Type type, MemberSerialization memberSerialization) in C:\Users\luukw\Desktop\stage\blacky-api\Blacky\Extensions\Resolver\AppContractResolver.cs:line 25

   at Newtonsoft.Json.Serialization.DefaultContractResolver.CreateObjectContract(Type objectType)

   at Newtonsoft.Json.Serialization.DefaultContractResolver.CreateContract(Type objectType)

   at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)

   at Newtonsoft.Json.Serialization.DefaultContractResolver.ResolveContract(Type type)

   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.GetContractSafe(Type type)

   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)

   at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)

   at Newtonsoft.Json.JsonSerializer.Deserialize(JsonReader reader, Type objectType)

   at Microsoft.AspNetCore.Mvc.Formatters.JsonInputFormatter.ReadRequestBodyAsync(InputFormatterContext context, Encoding encoding)}    System.ObjectDisposedException