title: PostgreSQL - Language pgplsql does not exist despite running CREATE LANGUAGE
body: <p>I just tried to create my first plpgsql function. When executing the script, I get </p>
  
  <p>ERROR: language "‘plpgsql’" does not exist</p>
  
  <p>I then run the command CREATE LANGUAGE plpgsql; which shows the following error:</p>
  
  <p>ERROR: language "plpgsql" already exists</p>
  
  <p>Commands are being run on the same database.</p>
  
  <p>Regards</p>
  
  <p>Peter</p>