problem.ex

defp set_tokens(conn, user_from_db) do
  case user_from_db.account_level do
    99 -> # Admin level
      Guardian.Plug.sign_in(conn, user_from_db, perms: %{admin: [:all]})
      redirect(conn, to: page_path(conn, :index))
    _ -> # Not yet implemented
      redirect(conn, to: page_path(conn, :index))
  end
end

# Error
## unable to encode value: {:perms, %{admin: [:all]}}