Magento无法登录管理控制台错误500

Question

I have a live running website developed using magento (1.8.1.0). The frontend is working fine but (from this morning) when I try to log in the admin panel I get the "http error 500" even if I use a wrong password or username.

Foreach login attempt the magento error log reports:

mod_fcgid: stderr: PHP Fatal error: Call to a member function loadByUsername() on a non-object in $MAGENTO_ROOT/httpdocs/includes/src/Mage_Admin_Model_User.php on line 408

the corresponding code in Mage_Admin_Model_User.php is:

406>  public function loadByUsername($username)
407>     {
408>       $this->setData($this->getResource()->loadByUsername($username));
409>       return $this;
410>     }

I have just deleted the cache and session directories but the problem remains.

what could have happened ? how can I fix it ?

Answer 1

(from this morning)

• Was there any update on server (hosting)? I would try to search on official Magento site if it is a common bug (other users can face it after update too)
• Test copy of installation (ftp + db) on different server (hosting) in order to see if the problem persists.
• Try to Google it similar to this ( $MAGENTO_ROOT/httpdocs/includes/src/ is your site specific so Google will find nothing relevant):

loadByUsername() on a non-object in Mage_Admin_Model_User.php on line 408

Answer 2

Thank's all for the contribute, the problem is solved. It was very sneaky.

I've found in the directory app/code/core/Mage/ the directory "Admin" renamed as "Admin " (Admin with 2 spaces). Moreover this files were missing: app/code/core/Mage/Admin/etc/config.xml and app/code/core/Mage/Admin/Helper/Data.php .

After renaming the directory, restoring files, deleting cache and session, the problem is solved. It was probably originated by a cache update in Cache Management section.