Unknown controller ‘user’

Hello,
I’ve installed both plugins, sent request to get the nonce (it returned 200 OK)
When I try to send POST to http://site.com/api/user/generate_auth_cookie/?username=john&password=PASSWORD-HERE it returns 200 OK with
{
“status”: “error”,
“error”: “Unknown controller ‘user’.”
}

What can be wrong and how I could fix that?