title: Can't execute pgAdmin4
body: <p>I installed Postgres9.6 ver And pgAdmin4 was installed together.
  But It is return message "The application server could not be contacted" When i execute pgadmin.</p>
  
  <p>I tried to download and install pgAdmin4 from web.
  But have not changed anything.</p>
  
  <p>I couldn't get anything Although I searched google about the message.</p>
  
  <p>I Set System Path, And Postgres is running in my local.
  But pgadmin don't start up.</p>
  
  <p>Do somebody know about this?
  Thank you.</p>
  
  <hr>
  
  <p>update:</p>
  
  <p>i found this
  <a href="https://superuser.com/questions/1097581/can-not-connect-to-pgadmin-server">question</a>.</p>
  
  <p>I think that is same my problem which got 3 good vote even if the message is different a little.</p>
  
  <p>So i'm trying do that, But can't run <code>setup.py</code>.</p>
  
  <p>I installed python. and run <code>pgAdmin\web\setup.py</code> with cmd as admin.
  But fail with message of </p>
  
  <blockquote>
    <p>from flask import Flask No module named 'flask' </p>
  </blockquote>
  
  <p>thank you.</p>