Raspberry pi : CakePHP sur un serveur Pancake

Bonjour,
Je vous présente mon projet je souhait créé un site web sur ma raspberry pi j'ai installé un serveur Pancake et je veux utiliser le frameworke CakePHP.
J'ai par contre un souci de configuration enfin je pense, voici ce que me donne mon localhost :

Warning: _cake_core_ cache was unable to write 'cake_dev_fr-fr' to File cache in /usr/local/Pancake/vhosts/default/lib/Cake/Cache/Cache.php on line 323

Warning: /usr/local/Pancake/vhosts/default/app/tmp/cache/persistent/ is not writable in /usr/local/Pancake/vhosts/default/lib/Cake/Cache/Engine/FileEngine.php on line 384

Fatal error: Uncaught exception 'CacheException' with message 'Cache engine _cake_core_ is not properly configured.' in /usr/local/Pancake/vhosts/default/lib/Cake/Cache/Cache.php:181 Stack trace: #0 /usr/local/Pancake/vhosts/default/lib/Cake/Cache/Cache.php(151): Cache::_buildEngine('_cake_core_') #1 /usr/local/Pancake/vhosts/default/app/Config/core.php(375): Cache::config('_cake_core_', Array) #2 /usr/local/Pancake/vhosts/default/lib/Cake/Core/Configure.php(72): include('/usr/local/Panc...') #3 /usr/local/Pancake/vhosts/default/lib/Cake/bootstrap.php(175): Configure::bootstrap(true) #4 /usr/local/Pancake/vhosts/default/app/webroot/index.php(94): include('/usr/local/Panc...') #5 /usr/local/Pancake/vhosts/default/index.php(41): require('/usr/local/Panc...') #6 {main} thrown in /usr/local/Pancake/vhosts/default/lib/Cake/Cache/Cache.php on line 181

Si quelqu'un peut m'aider je suis preneur !!
Merci d'avance.
Pierre-Baptiste