title: Postgresql: ERROR: type "citext" does not exist
body: <p>I have read other posts, when searching, an answer to this question.</p>
  
  <p>I am using PostgreSQL 9.1, and created extension 'citext' using <code>CREATE EXTENSION citext</code>, but when I try to create any columns of type 'citext', it throws this error</p>
  
  <blockquote>
    <p>ERROR:  type "citext" does not exist </p>
  </blockquote>
  
  <p>I researched but did not find any concrete answers? Any idea why?</p>