title: pytz.exceptions.UnknownTimeZoneError: 'Asia/kolkata'
body: <p>In my project (made in Virtual Environment), when I run the server, it gives me no errors. But when I open the 127.0.0.1:8000 , it gives me an error saying:</p>
  
  <pre><code>A server error occurred. Please contact the administrator.
  </code></pre>
  
  <p>Had referred the below post to set the timezone to 'Asia/kolkata':-</p>
  
  <p><a href="https://stackoverflow.com/questions/21855357/how-to-add-indian-standard-time-ist-in-django">How to add Indian Standard Time (IST) in Django?</a></p>
  
  <p>It worked fine till yesterday and today I got an error in prompt as:</p>
  
  <pre><code>  File "C:\Users\Ajay\Anaconda3\lib\site-packages\pytz\__init__.py", line 181, in timezone
      raise UnknownTimeZoneError(zone)
  pytz.exceptions.UnknownTimeZoneError: 'Asia/kolkata'
  </code></pre>
  
  <p>How to tackle this? (Using Django V2.1)</p>