I have a fatal error after upgrading joomla from 2.5.3 to 2.5.6 and couldnt find any solutions on all the forums. After failed to upgrade joomla via the admin backend, I downloaded and installed joomla upgrade 2.5.6 using the install extensions panel. And it said that installation was successfull.
Afterwards loging in to the admin panel, everythings is empty, only the "view site" and "logout" buttons to the top right are visible.
On the frontend following error is shown.
Warning: Invalid argument supplied for foreach() in /homepages/44/d33570217/htdocs/joomla/libraries/joomla/application/menu.php on line 90
Warning: Invalid argument supplied for foreach() in /homepages/44/d33570217/htdocs/joomla/includes/application.php on line 449
Warning: Creating default object from empty value in /homepages/44/d33570217/htdocs/joomla/includes/application.php on line 471
Fatal error: Call to a member function get() on a non-object in /homepages/44/d33570217/htdocs/joomla/templates/beez_20/error.php on line 10
the upgrade must have overwritten some files and I cannot localize the problem. It is not a template problem, I have tried switching it in the database. Configuration.php is also ok, all values are identical to before the upgrade.
Can someone help me to find out the problem? Thanks