hi,

I got the same problem right now, but thoose 2 nugets did not help. 

For me it was an obsolete nuget package, Microsoft.AspNet.SignalR.Owin. 

I wrote small method based on how EPiServer.Marketing.Testing.Web.Repositories.KpiWebRepository.GetKpiTypes() gets its types.

Published as gist:
https://gist.github.com/perhemmingson/05d5b94b371558b6dfc1f52406f56c7a

public void TestForLoaderExceptions()
        {
            try
            {
                ((IEnumerable<Assembly>)AppDomain.CurrentDomain.GetAssemblies())
                    .SelectMany<Assembly, Type>((Func<Assembly, IEnumerable<Type>>)(s => (IEnumerable<Type>)s.GetTypes())).ToList();
            }
            catch (ReflectionTypeLoadException e)
            {
                foreach (var e2 in e.LoaderExceptions)
                {
                    Console.WriteLine(e2);
                }
            }
        }