title: Error: Could not locate a Flask application
body: <blockquote>
  <p>Error: Could not locate a Flask application. You did not provide the &quot;FLASK_APP&quot; environment variable, and a &quot;wsgi.py&quot; or &quot;app.py&quot; module was not found in the current directory.</p>
  </blockquote>
  <p>I am facing this error for <code>flask run</code>.</p>