Nuget Packages Update, Runtime Error Each Request DTO can only be handled by 1 service.'

1

I have just updated all nuget packages and the ASP.NET MVC ServiceStack code stopped working with this runtime error:

System.Reflection.AmbiguousMatchException: ‘Could not register Request ‘ServiceStack.Register’ with service ‘ServiceStack.Auth.RegisterService’ as it has already been assigned to another service.
Each Request DTO can only be handled by 1 service.’

No change of the code has been made. Only update of nuget packages.

What could be the cause? How to troubleshoot?

2

OK have found the cause:

The functionality of

IncludeRegistrationService = true

has apparently changed.