Removed parentheses () from the request.build_absolute_uri function

physionet-django/templates/404.html

@@ -14,7 +14,7 @@ <h1>Page Not Found<br />(404)</h1>
   <p>If you think this is an error, please email us at: <a href="mailto:{{ ERROR_EMAIL }}?subject=Missing%20URL%20on%20{{ SITE_NAME }}&body={% filter urlencode %}Dear {{ SITE_NAME }} Team,
 
 The following URL is missing from the website:
-{{ request.build_absolute_uri() }}
+{{ request.build_absolute_uri }}
 {% if request.META.HTTP_REFERER %}
 This URL is linked from:
 {{ request.META.HTTP_REFERER }}