title: PostgreSQL (Django - Production ) - Function similarity(character varying, unknown) does not exist
body: <p>I just hosted my Django website on pythonanywhere with paid account. I am using Postgresql database, Everything is working fine but TrigramSimilarity is not working. In local host everything is working fine but in production it gives error. kindly help me , i have been searching but haven't found anything. Thanks in advance.</p>
  <p>Error:
  Exception Value:<br />
  function similarity(character varying, unknown) does not exist</p>