NotImplementedError: Can't perform this operation for unregistered loader type
<p>I'm making a small script to generate an HTML file. For this purpose, I'm using <code>jinja2</code>. </p>

<p>This is my script (found in the <code>jinja2</code> documentation):</p>

<pre><code># -*- coding: utf-8 -*-

from jinja2 import Environment, PackageLoader

env = Environment(loader = PackageLoader('monapplication', 'templates'))
template = env.get_template('index.html')
print(template.render(message = "Bienvenue sur mon site !"))
</code></pre>

<p>The package "monapplication" contains the folder "templates" where my index.html file is located.</p>

<p>But when I run the script, I get this error:</p>

<blockquote>
  <p>"NotImplementedError; Can't perform this operation for unregistered
  loader type."</p>
</blockquote>

<p>I did some research, but I didn't find any solution for my problem.</p>

<p>My OS is Windows 10.</p>