title: superset flask fab create-admin not working
body: <p>I have installed superset using <code>pip install apache-superset</code> command. 
  Then i try to flask fab create-admin but it's saying : <code>Error: Could not import "superset.superset"</code>.</p>
  
  <p>Can anyone help me here?</p>
  
  <pre><code>(superset) D:\dev\python\python_vir_env\superset\Lib\site-packages\superset&gt;set FLASK_APP=superset
  (superset) D:\dev\python\python_vir_env\superset\Lib\site-packages\superset&gt;flask fab create-admin
  
  Username [admin]: admin
  User first name [admin]: jvcson
  User last name [user]: pam
  Email [admin@fab.org]: 123@qq.com
  Password:
  Repeat for confirmation:
  
  2020-04-14 15:06:21,254:INFO:root:logging was configured successfully
  2020-04-14 15:06:21,419:INFO:root:Configured event logger of type &lt;class 'superset.utils.log.DBEventLogger'&gt;
  
  Usage: flask fab create-admin [OPTIONS]
  Error: Could not import "superset.superset".
  </code></pre>