while going through the django tutorial i commited a error and because of which i cannot execute the python manage.py runserver. The errors are attached below

Detail.html:

<h1>{{ question.question_text }}</h1>

{% if error_message %}<p><strong>{{ error_message }}</strong></p>{% endif %}

<form action="{% url 'polls:vote' question.id %}" method="post">

{% csrf_token %}

{% for choice in question.choice_set.all %}

  <input type="radio" name="choice" id="choice{{ forloop.counter }}"

value="{{ choice.id }}" />

  <label for="choice{{ forloop.counter }}">{{ choice.choice_text }}

</label><br />

{% endfor %}

<input type="submit" value="vote" />

</form>

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