title: Joomla 2.5 got JAuthentication: :__construct: Could not load authentication libraries
body: <p>I just finished install Joomla 2.5 and then I did log-in at administrator but I got error message</p>
  
  <pre><code> "JAuthentication: :__construct: Could not load authentication libraries."
  </code></pre>
  
  <p>AND home page I got bellow message</p>
  
  <pre><code>JERROR_LOADING_MENUS
  Error loading component: , 1
  Component not found
  </code></pre>
  
  <p>I download "Joomla_2.5.8-Stable-Full_Package.zip" from joomla.org.
  So I tried to do </p>
  
  <blockquote>
    <p>Find "Extantions" table.</p>
    
    <p>In extantions table, go to page 3 or 4, and find there "plg_authentication_joomla" - enaible it from 0 to 1.</p>
  </blockquote>
  
  <p>but not work.</p>
  
  <p>Please advise me.</p>