Fatal error: Call to undefined method: stdClass->onAuthenticate() in /home/sitename/libraries/joomla/user/authentication.php on line 121 (Joomla! 1.5)

When trying to log into the backend after entering the username and password and as soon as you click on login, I get the following error. Fatal error: Call to undefined method: stdClass->onAuthenticate() in /home/sitename/libraries/joomla/user/authentication.php on line 121 (Joomla! 1.5)

Solution

Change the file permissions of the plugin folder to at least 755. And try again and the backend should load perfectly

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• |2010-10-01 07:33:28 boss - fatal error
  When trying to log into the administrator page after entering the username and
  password and as soon as you click on login ..... this error will comes..Fatal
  error: Call to undefined method stdClass::onAuthenticate() in
  /home/optisol/public_html/onlinecourse/libraries/j oomla/user/authentication.php
  on line 121
  
  
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• |2010-10-01 07:38:23 boss - error
  send the comment to me quickly
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• |2010-10-01 08:07:20 TechPortal - @boss
  Did you try changing the permissions of the plugin folder?
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• |2010-10-01 08:22:57 b - error
  how to find this comment {Did you try changing the permissions of the plugin
  folder? }
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• |2010-10-03 16:27:19 Anonymous - Didn't work for me
  I have the exact same error and chmod on plugins didn't work for me. I even did
  this to make sure all perms were correct:
  
  find . -type f -exec chmod 644 {} \;
  find . -type d -exec chmod 755 {} \;
  
  
  and I put unzipped a fresh copy of joomla on top and that didn't work. Any
  other ideas on this?
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• |2010-10-04 06:24:59 TechPortal - re: Didn't work for me
  Anonymous wrote:

  I have the exact same error and chmod on plugins didn't work for me. I even did
  this to make sure all perms were correct:
  
  find . -type f -exec chmod 644 {} \;
  find . -type d -exec chmod 755 {} \;
  
  
  and I put unzipped a fresh copy of joomla on top and that didn't work. Any
  other ideas on this?

  Maybe check the ownership of the folder, chown apache:apache or chmod to 777 for
  testing purposes to make absulutely sure the permissions aren't the issue
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