After activating error reporting from the configuration.php file
public $error_reporting = 'default'; to public $error_reporting = 'maximum'
When I refreshed the page I've got the following error:
Fatal error: Call to a member function isAdmin() on a non-object in /Users/username/Sites/mysite/plugins/system/remember/remember.php on line 42
I've found the following solution on various pages and forums that seems to work for many people, however it did not work for me since my site did not show the Database Fix Button.
1. Rename the "remember.php" file to "remember_old.php" in "root/plugins/system/remember".
2. Reload the Admin Panel. This time it will be loaded. It will look a bit weird (broken) but you will still be able to access what you need.
3. Go to Extensions -> Extension Manage -> Database and click on the "Fix" button. Thishow your Database wil be upgraded.
4. Go back to "root/plugins/system/remember" and rename the "remember_old.php" file back to "remember.php".
IF THE DATABASE FIX BUTTON DOES NOT SHOW DO THE FOLLOWING:
If you get the error on the "Fix" database option you should create the table "xxxx_content_types" in your database (mySQL) by the following SQL query:
CREATE TABLE IF NOT EXISTS `xxxx_content_types` (
`id` int(11) NOT NULL,
`content_history_options` varchar(5120) NOT NULL COMMENT 'JSON string for com_contenthistory options'
) ENGINE=MyISAM DEFAULT CHARSET=latin1;
[You have to remember to chage the dbprefix xxxx_ to your database dbprefix.]
After creating the table the fix option button should show up on Extensions/Database, after fixing the database the problem is solved.