Custom Authentication

I am getting the following error when trying to implement a custom IEntityLoginManager:

The formatter threw an exception while trying to deserialize the message: There was an error while trying to deserialize parameter http://ideablade.com/EntityModel:LoginResult. The InnerException message was 'Element 'http://ideablade.com/EntityModel:Principal' contains data of the 'http://schemas.datacontract.org/2004/07/System.Security.Principal:GenericPrincipal' data contract. The deserializer has no knowledge of any type that maps to this contract. Add the type corresponding to 'GenericPrincipal' to the list of known types - for example, by using the KnownTypeAttribute attribute or by adding it to the list of known types passed to DataContractSerializer.'. Please see InnerException for more details.


Element 'http://ideablade.com/EntityModel:Principal' contains data of the 'http://schemas.datacontract.org/2004/07/System.Security.Principal:GenericPrincipal' data contract. The deserializer has no knowledge of any type that maps to this contract. Add the type corresponding to 'GenericPrincipal' to the list of known types - for example, by using the KnownTypeAttribute attribute or by adding it to the list of known types passed to DataContractSerializer.



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This is based on the example in the documentation:

   public System.Security.Principal.IPrincipal Login(ILoginCredential credential, EntityManager entityManager)
        {
            // Disallow null credentials and throw a LoginException
            if (credential == null) {
               throw new LoginException( LoginExceptionType.NoCredentials, "Credentials not supplied");
            }
            
            //HttpContext.Current
            // Build a simple Principal/Identity. You may return any serializable
            // types implementing IPrincipal.
            GenericIdentity identity = new GenericIdentity(credential.UserName);
            
            GenericPrincipal principal = new GenericPrincipal(identity, new string[] { });
            
            
            return principal;
        }



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What am I doing wrong?

Do you have an example of that?

I think I am find the biggest thing with DevForce is finding the answers for the latest version. I know documentation is tough, but it seems like there have a been a ton of changes that make it to where you can't even search on stuff to find the correct answer. Also the docs seem a little scattered or need a better way to search the learning resources.