Hi Joomla Users,
This post will help you to fix the error post Joomla installation. It has been observed that this error is with Joomla 3 version.
QuoteError Your host needs to disable magic_quotes_gpc to run this version of Joomla!
If your server has suPHP compiled, copy the server's php.ini under your account. Open in this file and set magic_quotes_gpc to Off. Once done, open the .htaccess file and the code below. Doing this, the php.ini will be effective to the whole account.
QuoteSetEnv PHPRC /home/cPanel-user/public_html
If your server does not have suPHP compiled, you can disable magic_quotes_gpc using .htaccess file. Open the .htaccess file and add the code below.
Quotephp_flag magic_quotes_gpc off
Note: If you are on a shared hosting package, ask your host to copy the server's php.ini under your account.
Now, try accessing Joomla & error is gone !