500 internal server error at back end - Joomla

Question

I have installed new site in Joomla 1.7 and its working fine, but when i checked its back-end (administrator) got 500 Internal Server Error.

Note: Site

Answer 1

I experienced something similar on my site. Digging through the log file, /administrator/error_log i saw this error message:

[08-Oct-2012 15:28:59] PHP Fatal error: Call to a member function login() on a non-object in /home/XXX/public_html/administrator/components/com_login/admin.login.php on line 65 .

Problem was, i had a previous installation of Joomla 1.5.x, and uploaded files for Joomla 1.6 to replace the previous files and upgrade security of the site. Took me almost a month to find a solution for my own case;

Finally found out from this website that I needed to completely delete all previous files in the website root directory before uploading a new version of Joomla.

Hope this helps someone out there who is in the same situation!