error on cakephp cache

i've got this error:

Warning (2): extract() [function.extract]: First argument should be an array [CORE/cake/libs/cache.php, line 295]

Code | Context

$check      =      false
$config      =      false
$_this      =      Cache
Cache::$_Engine = array
Cache::$__config = array
Cache::$__name = NULL
Cache::$_log = NULL
$current      =      null

extract - [internal], line ??
Cache::clear() - CORE/cake/libs/cache.php, line 295
MenusController::__grantAccess() - APP/controllers/menus_controller.php, line 157
MenusController::edit() - APP/controllers/menus_controller.php, line 78
Object::dispatchMethod() - CORE/cake/libs/object.php, line 116
Dispatcher::_invoke() - CORE/cake/dispatcher.php, line 261
Dispatcher::dispatch() - CORE/cake/dispatcher.php, line 233
[main] - APP/webroot/index.php, line 84

Notice (8): Undefined variable: engine [CORE/cake/libs/cache.php, line 297]

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This is the code on these 2 errors:

(295)            extract($config);

(297)            if (!$_this->isInitialized($engine)) {
                  return false;
            }

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Does anyone have any idea on how to solve it?
I have several errors with the cake-libs. Most of them on cache i guess. I've also noticed there is nothing being written to the /app/tmp/cache directory. Is this due to a cakephp- or serversetting? If so, what setting?
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