[Answered ]-NoReverseMatch at /cart/ Reverse for 'ProductView' not found. 'ProductView' is not a valid view function or pattern name

The issue is with this commented line,

  <!-- <div class="d-grid"><a href="{% url 'ProductView' %}" class="btn btn-primary">Continue Shopping</a></div> -->

Change it to

 <!-- <div class="d-grid"><a href="{% url 'home' %}" class="btn btn-primary">Continue Shopping</a></div> -->

Even if the line is commented the Django template will render the URL template tags.