res/views/error.twig
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Error</title>
<link rel="stylesheet" type="text/css" href="//maxcdn.bootstrapcdn.com/bootswatch/3.2.0/paper/bootstrap.min.css">
</head>
<body>
<div class="container-fluid text-center container" role="main" id="container">
<div class="row"> </div>
<div class="row">
<div class="col-md-4 col-md-offset-4 col-xs-10 col-xs-offset-1">
<div class="alert alert-danger">
{{ message }}
</div>
<div class="text-center">
<a href="{{ path('home') }}">Return to home</a>
</div>
</div>
</div>
</div>
</body>
</html>