title: ModuleNotFoundError when running .PY file from Nodejs on Heroku
body: <p>My Nodejs webserver runs a python file on Heroku. Logs show following error:</p>
  <pre><code>2021-12-23T18:54:48 app[web.1]: File &quot;./test.py&quot;, line 3, in &lt;module&gt;
  2021-12-23T18:54:48 app[web.1]: import instaloader
  2021-12-23T18:54:48 app[web.1]: ModuleNotFoundError: No module named 'instaloader'
  </code></pre>
  <p>requirements.txt</p>
  <pre><code>instaloader==4.8.2
  requests==2.26.0
  pymongo==4.0.1
  </code></pre>
  <p>runtime.txt</p>
  <pre><code>python-3.6.15
  </code></pre>
  <p>When adding the python buildpack the entire application stops working. Note: Im not running a python webserver, just this one file from nodejs. Everything works locally.</p>