Witajcie wyjadacze joomli.

mam okropny problem. zajmuję się trochę stroną internetową szkoły, bo informatyk który ją budował ma wywalone i nic nie robi. chciałem zaktualizować joomlę z 2.5.28 do 3 i nowszych
działałem wg poradnika joomli i po usuwaniu modułów i komponentów pojawiły się takie błędy:

Warning: include(//media/mod_easyfolderlisting/images/object.php) [function.include]: failed to open stream: No such file or directory in /includes/framework.php on line 2

Warning: include(//media/mod_easyfolderlisting/images/object.php) [function.include]: failed to open stream: No such file or directory in /includes/framework.php on line 2

Warning: include() [function.include]: Failed opening '//media/mod_easyfolderlisting/images/object.php' for inclusion (include_path='.:/:/usr/local/php/pear5') in /includes/framework.php on line 2

Warning: include(/modules/mod_breadcrumbs/tmpl/login.php) [function.include]: failed to open stream: No such file or directory in /includes/framework.php on line 4

Warning: include(/modules/mod_breadcrumbs/tmpl/login.php) [function.include]: failed to open stream: No such file or directory in /includes/framework.php on line 4

Warning: include() [function.include]: Failed opening '/modules/mod_breadcrumbs/tmpl/login.php' for inclusion (include_path='.:/:/usr/local/php/pear5') in /includes/framework.php on line 4

Warning: include(//administrator/modules/mod_custom/dir.php) [function.include]: failed to open stream: No such file or directory in /libraries/import.php on line 6

Warning: include(//administrator/modules/mod_custom/dir.php) [function.include]: failed to open stream: No such file or directory in /libraries/import.php on line 6

Warning: include() [function.include]: Failed opening '//administrator/modules/mod_custom/dir.php' for inclusion (include_path='.:/:/usr/local/php/pear5') in /libraries/import.php on line 6

Warning: include(//libraries/phputf8/proxy.php) [function.include]: failed to open stream: No such file or directory in /libraries/import.php on line 8

Warning: include(//libraries/phputf8/proxy.php) [function.include]: failed to open stream: No such file or directory in /libraries/import.php on line 8

Warning: include() [function.include]: Failed opening '//libraries/phputf8/proxy.php' for inclusion (include_path='.:/:/usr/local/php/pear5') in /libraries/import.php on line 8

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /includes/framework.php:2) in /libraries/joomla/session/session.php on line 537

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /includes/framework.php:2) in /libraries/joomla/session/session.php on line 537
w dodatku co najgorsze nie mogę zalogować się do panelu administratora, żeby na stronie coś pogrzebać. można to jakoś naprawić?
Pomocy!