Persistent model to true -> Fatal error

Hi all,

when i activate persistent model to true in my application, it breaks
my models, I'm getting the following fatal errors:

Fatal error: PhotosController::index() [<a href='http://php.net/
photoscontroller.index'>photoscontroller.index</a>]: The script tried
to execute a method or access a property of an incomplete object.
Please ensure that the class definition &quot;Albuns&quot; of the
object you are trying to operate on was loaded _before_ unserialize()
gets called or provide a __autoload() function to load the class
definition in /Volumes/Data/paulogomes/www/pg/controllers/
photos_controller.php on line 32
---
Fatal error: BehaviorCollection::trigger() [<a href='http://php.net/
behaviorcollection.trigger'>behaviorcollection.trigger</a>]: The
script tried to execute a method or access a property of an incomplete
object. Please ensure that the class definition
&quot;ExtendAssociationsBehavior&quot; of the object you are trying to
operate on was loaded _before_ unserialize() gets called or provide a
__autoload() function to load the class definition in /Volumes/Data/
paulogomes/www/cake/libs/model/behavior.php on line 456
---
Fatal error: ResourcesController::index() [<a href='http://php.net/
resourcescontroller.index'>resourcescontroller.index</a>]: The script
tried to execute a method or access a property of an incomplete
object. Please ensure that the class definition &quot;Types&quot; of
the object you are trying to operate on was loaded _before_ unserialize
() gets called or provide a __autoload() function to load the class
definition in /Volumes/Data/paulogomes/www/pg/controllers/
resources_controller.php on line 29

the error only occurs on second call of controller, after persistent
cache files created on tmp.
I'm using cakephp 1.2 running on leopard with php 5.2.6.

Any ideas?

Thanks.
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