You cannot serialize or unserialize PDO instances error

[Truper63]

After adding to Zend 2 startup project I get the following error when attempting to log in or register.

You cannot serialize or unserialize PDO instances

Partial stack trace.

0 C:\Program Files (x86)\Zend\ZendServer\data\apps\httpdefault\0\ZendDemoApp\1.0_2\vendor\coolcsn\csn-user\view\csn-user\registration\registration.phtml(93): PDO->__sleep()

1 C:\Program Files (x86)\Zend\ZendServer\data\apps\httpdefault\0\ZendDemoApp\1.0_2\vendor\coolcsn\csn-user\view\csn-user\registration\registration.phtml(93): Zend\Form\View\Helper\Form->openTag(Object(Zend\Form\Form))

2 C:\Program Files (x86)\Zend\ZendServer\data\apps\httpdefault\0\ZendDemoApp\1.0_2\vendor\zendframework\zend-view\src\Renderer\PhpRenderer.php(501): include('C:\Program File...')

3 C:\Program Files (x86)\Zend\ZendServer\data\apps\httpdefault\0\ZendDemoApp\1.0_2\vendor\zendframework\zend-view\src\View.php(205): Zend\View\Renderer\PhpRenderer->render(Object(Zend\View\Model\ViewModel))

4 C:\Program Files (x86)\Zend\ZendServer\data\apps\httpdefault\0\ZendDemoApp\1.0_2\vendor\zendframework\zend-view\src\View.php(233): Zend\View\View->render(Object(Zend\View\Model\ViewModel))

5 C:\Program Files (x86)\Zend\ZendServer\data\apps\httpdefault\0\ZendDemoApp\1.0_2\vendor\zendframework\zend-view\src\View.php(198): Zend\View\View->renderChildren(Object(Zend\View\Model\ViewModel))

6 C:\Program Files (x86)\Zend\ZendServer\data\apps\httpdefault\0\ZendDemoApp\1.0_2\vendor\zendframework\zend-mvc\src\View\Http\DefaultRenderingStrategy.php(103): Zend\View\View->render(Object(Zend\View\Model\ViewModel))

7 [internal function]: Zend\Mvc\View\Http\DefaultRenderingStrategy->render(Object(Zend\Mvc\MvcEvent))