title: Warning while using nbconvert to convert .ipynb to html
body: <p>I have nbconvert version 6.4.2 installed on my macpro. And i am using following command to get html output from command line;</p>
  <pre><code>jupyter nbconvert --to html Used-air-loose-data.ipynb
  </code></pre>
  <p>But it gives a warning message;</p>
  <pre><code> File &quot;/Users/jsingh/.local/share/virtualenvs/Air_assignee_analysis-SSL-Cc05/lib/python3.9/site-packages/jinja2/loaders.py&quot;, line 566, in load
  raise TemplateNotFound(name)
  jinja2.exceptions.TemplateNotFound: index.html.j2
  </code></pre>
  <p>But I can find some default templates at the location;
  <code>/Users/jsingh/.local/share/virtualenvs/Air_assignee_analysis-SSL-Cc05/share/jupyter/nbconvert/templates/lab</code>
  May I get some help here, how can I make the right template and put it in correct location. Thanks in advance.</p>