<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Jogoteca</title>
<link rel="stylesheet" href="{{ url_for('static', filename='bootstrap.css') }}">
</head>
<body>
<div class="container">
{% with messages = get_flashed_messages() %}
{% if messages %}
<ul id="messages" class="list-unstyled">
{% for message in messages %}
<li class="alert alert-success">{{ message }}</li>
{% endfor %}
</ul>
{% endif %}
{% endwith %}
<h1>Faça seu login</h1>
<form method="POST" action="{{ url_for('autenticar') }}">
<input type="hidden" name="proxima" value="{{ proxima or url_For('index') }}"/>
<p><label>Nome de usuário:</label> <input class="form-control" type="text" name="usuario" required></p>
<p><label>Senha:</label> <input class="form-control" type="password" name="senha" required></p>
<p><button class="btn btn-primary" type="submit">Entrar</button></p>
</form>
</div>
</body>
</html>E recebo jinja2.exceptions.UndefinedError: 'url_For' is undefined, não entendo o porque desse erro.
