title: The Response content must be a string or object implementing __toString(), "boolean" given in laravel 5.4
body: <p>I am using Sentinel package for advanced authentication in laravel. I can register properly, but when I am going to login then here is an error like - 'The Response content must be a string or object implementing __toString(), "boolean" given.' Please anyone help me.</p>
  
  <p>Here is my routes bellow:</p>
  
  <pre><code> Route::get('/login', 'LoginController@login');
   Route::post('/login', 'LoginController@postLogin');
  </code></pre>
  
  <p>Here is my controller bellow:</p>
  
  <pre><code> public function login(){
      return view('authentication.login');
  }
  
  public function postLogin(Request $request){
      Sentinel::authenticate($request-&gt;all());
      return Sentinel::check();
  }
  </code></pre>