title: heroku - Couldn't find that process type (web)
body: <p>I am following the tutorial <a href="https://devcenter.heroku.com/articles/getting-started-with-python#deploy-the-app" rel="nofollow noreferrer">here</a></p>
  <p>but I got the error</p>
  <pre><code>Scaling dynos... !
   ▸    Couldn't find that process type (web).
  </code></pre>
  <p>when doing</p>
  <pre><code>heroku ps:scale web=1
  </code></pre>
  <p>I followed the solution <a href="https://help.heroku.com/W23OAFGK/why-am-i-seeing-couldn-t-find-that-process-type-when-trying-to-scale-dynos" rel="nofollow noreferrer">here</a></p>
  <p>by delete the buildpack and use <code>heroku buildpacks:set heroku/python</code></p>
  <p>But the error still happend</p>
  <p>and for buildpacks:</p>
  <pre><code>heroku buildpacks
  === teaching-system Buildpack URL
  heroku/python
  </code></pre>
  <p>it seem to be correct</p>
  <p>What is wrong with it?</p>