title: what is the reason of PLS-00201: identifier 'DBMS_REPCAT_INTERNAL_PACKAGE' must be declared
body: <p>In the user_errors I have this error <br/></p>
  
  <blockquote>
    <blockquote>
      <p>PLS-00201: identifier 'DBMS_REPCAT_INTERNAL_PACKAGE' must be declared</p>
    </blockquote>
  </blockquote>
  
  <p><br/> what is the cause of this error and how to solve it ?. I searched over the internet and nothing is clear.</p>