[fw-mvc] problem when loading form:

When loading my registration form I get the following error:

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP Notice:  Array to string conversion in /var/www/Zend/ZendFramework-1.10.7/library/Zend/View/Helper/HtmlElement.php on line 105

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP Stack trace:

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP   1. {main}() /var/www/nrka2/public/index.php:0

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP   2. require() /var/www/nrka2/public/index.php:2

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP   3. Zend_Application->run() /var/www/nrka2/application/application.php:29

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP   4. Bootstrap->run() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Application.php:366

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP   5. Zend_Application_Bootstrap_Bootstrap->run() /var/www/nrka2/application/bootstrap/Bootstrap.php:183

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP   6. Zend_Controller_Front->dispatch() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Application/Bootstrap/Bootstrap.php:97

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP   7. Zend_Controller_Dispatcher_Standard->dispatch() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Controller/Front.php:954

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP   8. Zend_Controller_Action->dispatch() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Controller/Dispatcher/Standard.php:295

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP   9. Zend_Controller_Action_HelperBroker->notifyPostDispatch() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Controller/Action.php:523

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  10. Zend_Controller_Action_Helper_ViewRenderer->postDispatch() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Controller/Action/HelperBroker.php:277

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  11. Zend_Controller_Action_Helper_ViewRenderer->render() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Controller/Action/Helper/ViewRenderer.php:957

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  12. Zend_Controller_Action_Helper_ViewRenderer->renderScript() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Controller/Action/Helper/ViewRenderer.php:918

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  13. Zend_View_Abstract->render() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Controller/Action/Helper/ViewRenderer.php:897

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  14. Zend_View->_run() /var/www/Zend/ZendFramework-1.10.7/library/Zend/View/Abstract.php:880

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  15. include() /var/www/Zend/ZendFramework-1.10.7/library/Zend/View.php:108

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  16. Zend_Form->__toString() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Form.php:0

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  17. Zend_Form->render() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Form.php:2903

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  18. Zend_Form_Decorator_FormElements->render() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Form.php:2887

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  19. Zend_Form_Element->render() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Form/Decorator/FormElements.php:101

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  20. Zend_Form_Decorator_ViewHelper->render() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Form/Element.php:2020

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  21. Zend_View->formText() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Form/Decorator/ViewHelper.php:246

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  22. Zend_View_Abstract->__call() /var/www/Zend/ZendFramework-1.10.7/library/Zend/View/Abstract.php:0

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  23. call_user_func_array() /var/www/Zend/ZendFramework-1.10.7/library/Zend/View/Abstract.php:342

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  24. Zend_View_Helper_FormText->formText() /var/www/Zend/ZendFramework-1.10.7/library/Zend/View/Abstract.php:0

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  25. Zend_View_Helper_HtmlElement->_htmlAttribs() /var/www/Zend/ZendFramework-1.10.7/library/Zend/View/Helper/FormText.php:79

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  26. implode() /var/www/Zend/ZendFramework-1.10.7/library/Zend/View/Helper/HtmlElement.php:105

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP Notice:  Array to string conversion in /var/www/Zend/ZendFramework-1.10.7/library/Zend/View/Helper/HtmlElement.php on line 105

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP Stack trace:

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP   1. {main}() /var/www/nrka2/public/index.php:0

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP   2. require() /var/www/nrka2/public/index.php:2

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP   3. Zend_Application->run() /var/www/nrka2/application/application.php:29

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP   4. Bootstrap->run() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Application.php:366

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP   5. Zend_Application_Bootstrap_Bootstrap->run() /var/www/nrka2/application/bootstrap/Bootstrap.php:183

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP   6. Zend_Controller_Front->dispatch() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Application/Bootstrap/Bootstrap.php:97

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP   7. Zend_Controller_Dispatcher_Standard->dispatch() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Controller/Front.php:954

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP   8. Zend_Controller_Action->dispatch() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Controller/Dispatcher/Standard.php:295

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP   9. Zend_Controller_Action_HelperBroker->notifyPostDispatch() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Controller/Action.php:523

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  10. Zend_Controller_Action_Helper_ViewRenderer->postDispatch() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Controller/Action/HelperBroker.php:277

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  11. Zend_Controller_Action_Helper_ViewRenderer->render() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Controller/Action/Helper/ViewRenderer.php:957

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  12. Zend_Controller_Action_Helper_ViewRenderer->renderScript() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Controller/Action/Helper/ViewRenderer.php:918

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  13. Zend_View_Abstract->render() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Controller/Action/Helper/ViewRenderer.php:897

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  14. Zend_View->_run() /var/www/Zend/ZendFramework-1.10.7/library/Zend/View/Abstract.php:880

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  15. include() /var/www/Zend/ZendFramework-1.10.7/library/Zend/View.php:108

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  16. Zend_Form->__toString() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Form.php:0

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  17. Zend_Form->render() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Form.php:2903

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  18. Zend_Form_Decorator_FormElements->render() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Form.php:2887

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  19. Zend_Form_Element->render() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Form/Decorator/FormElements.php:101

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  20. Zend_Form_Decorator_ViewHelper->render() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Form/Element.php:2020

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  21. Zend_View->formText() /var/www/Zend/ZendFramework-1.10.7/library/Zend/Form/Decorator/ViewHelper.php:246

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  22. Zend_View_Abstract->__call() /var/www/Zend/ZendFramework-1.10.7/library/Zend/View/Abstract.php:0

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  23. call_user_func_array() /var/www/Zend/ZendFramework-1.10.7/library/Zend/View/Abstract.php:342

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  24. Zend_View_Helper_FormText->formText() /var/www/Zend/ZendFramework-1.10.7/library/Zend/View/Abstract.php:0

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  25. Zend_View_Helper_HtmlElement->_htmlAttribs() /var/www/Zend/ZendFramework-1.10.7/library/Zend/View/Helper/FormText.php:79

[Sun Aug 01 10:35:19 2010] [error] [client 127.0.0.1] PHP  26. implode() /var/www/Zend/ZendFramework-1.10.7/library/Zend/View/Helper/HtmlElement.php:105

This is the code in my form:

<?php
class EventManager_Form_User_Base extends SF_Form_Abstract{
    public function init(){

        $this->addElementPrefixPath(
            'EventManager_Validate',
        APPLICATION_PATH . '/modules/eventManager/models/validate',
            'validate'
            );
        $this->addPrefixPath(
            'EventManager_Form_Element',
            APPLICATION_PATH.'/modules/eventManager/forms/element',   
            'element'
        );
        $this->getView()->addScriptPath(APPLICATION_PATH.'/modules/eventManager/forms/element');
               
            $this->addElement('select','usr_prefix',array(
            'required'         =>true,
            'label'            =>'Title',
            'multiOptions'    => array('Dhr'=>'Dhr', 'Mevrouw'=>'Mevrouw')
            ));
            /*
            $this->addElement('text','usr_firstname', array(
            'filters'    => array('StringTrim'),
            'valdators'    => array(
                'Alpha',
            array('StringLength',true,array(3,128))
            ),
            'required'    =>    true,
            'label'        => 'Firstname',
            ));*/
           
            $this->addElement('text','usr_surname', array(
            'filters'    => array('StringTrim'),
            'valdators'    => array(
                'Alpha',
            array('StringLength',true,array(3,128))
            ),
            'required'    =>    true,
            'label'        => 'lastname',
            ));
           
            $this->addElement('text','usr_email', array(
            'filters'    => array('StringTrim', 'StringToLower'),
            'validators'    => array(
            array('StringLength',true,array(3,128)),
            array('EmailAddress'),
            array('UniqueEmail', false, array(new EventManager_Model_User())),
            ),
            'required'    =>    true,
            'label'        => 'email',
            ));
           
            $this->addElement('password','usr_password',array(
            'filters'        =>    array('StringTrim'),
            'validators'    =>     array(
            array('StringLength',true, array(6,128))
            ),
            'required'    =>true,
            'label'        =>'Password'   
            ));
            $this->addElement('password','passwdVerify',array(
            'filters'        =>    array('StringTrim'),
            'validators'    =>     array(
                'PasswordVerification'
                ),
            'required'    =>true,
            'label'        =>'Confirm password'   
            ));

            $this->addElement('submit','submit', array(
            'required'    =>false,
            'ignore'    =>true,
            'decorators'=> array('ViewHelper',array('HtmlTag',array('tag' => 'dd','id' =>'form-submit')))
            ));
            $this->addElement('hidden','usr_id', array(
            'filters'    =>    array('StringTrim'),
            'required'    =>    true,
            'decorators'=>    array('ViewHelper',array('HtmlTag',array('tag' => 'dd','id' =>'form-submit')))
            ));
    }

}

class EventManager_Form_User_Register extends EventManager_Form_User_Base{
    public function init(){
        parent::init();

        $this->removeElement('usr_id');
        $this->getElement('submit')->setLabel('Register');
        $this->removeElement('role');
    }
}


Any idea's what goes wrong?