Uncaught Error: Trying to send an unexpected type of value through port auth0authResult:

[UlisesVD]

I dont't understand why the only difference is that I am using elm v0.19.1.
and the error is launch when I execute this:
elmApp.ports.auth0authResult.send(result);

the result has this value :
{err: null, ok: {…}}
err: null
ok: {profile: {…}, token: "bBw6AQpOktGxZ2z9HISUIqxHDXnP8xk8"}
proto: Object

that value is received by this type alias:

type alias RawAuthenticationResult =
    { err : Maybe AuthenticationError
    , ok : Maybe LoggedInUser
    }