title: Why does running `flask run` on Windows result in "flask is not recognized as an internal or external command, operable program or batch file"
body: <p>I needed to setup Flask for windows, so I ran the following commands:</p>
  <pre><code>set FLASK_APP=application.py
  set FLASK_DEBUG=1
  set DATABASE_URL='postgres.......' =&gt;(the credential given by the Heroku account)
  flask run
  </code></pre>
  <p>But when I hit enter on the <code>flask run</code>, I get an error that says -</p>
  <blockquote>
  <p>flask is not recognized as an internal or external command, operable program or batch file</p>
  </blockquote>
  <p>Why is this not working? I've been trying to work on it but I'm still having the same error message.</p>
  <p>What could be the issue?</p>