Sentinel Reminder::exists()错误

Question

您好，我正在使用Cartalyst/Sentinel登录系统，一切工作正常，但下面的提醒：：exists($user)函数给出了这个错误Argument 1 passed to Cartalyst\Sentinel\Reminders\IlluminateReminderRepository::exists() must implement interface cartalyst\Sentinel\Users\UserInterface

代码与示例页面上给出的代码相同。https://cartalyst.com/manual/sentinel/2.0#reminder-exists-user

$user = Sentinel::findById($credentials);

//dd($user); // this dump user return collection object of user

 $reminder = Reminder::exists( $user );