netbox/netbox/templates/exceptions/import_error.html

{% extends '500.html' %}

{% block message %}
  <p>
    A module import error occurred during this request. Common causes include the following:
  </p>
  <p>
    <i class="mdi mdi-alert"></i> <strong>Missing required packages</strong> - This installation of NetBox might be
    missing one or more required Python packages. These packages are listed in <code>requirements.txt</code> and
    <code>local_requirements.txt</code>, and are normally installed as part of the installation or upgrade process. To
    verify installed packages, run <code>pip freeze</code> from the console and compare the output to the list of
    required packages.
  </p>
  <p>
    <i class="mdi mdi-alert"></i> <strong>WSGI service not restarted after upgrade</strong> - If this installation has
    recently been upgraded, check that the WSGI service (e.g. gunicorn or uWSGI) has been restarted. This ensures that
    the new code is running.
  </p>
{% endblock message %}