Zend Framework Error

[NikhilK]

I am getting below error while accessing by website having PHP 5.4 version running on REHL-7 with Zend framework as 1.11.11. Can anyone help in resolving the below issue.

Error:: "Argument 1 passed to Zend_View_Helper_Navigation_HelperAbstract::setAcl() must be an instance of Zend_Acl, boolean given, called in /var/www/html/amov/library/Buza/Controller/Plugin/Navigation.php on line 48 and defined', '/var/www/html/amov/library/Zend/View/Helper/Navigation/HelperAbstract.php', 333"

Code in Navigation.php file:

    $view = $layout->getView();
    $view->navigation($navigation)
        ->pikeMenu()
        ->setACL(Zend_Registry::get('acl'))
        ->setRoles(Zend_Auth::getInstance()->getIdentity()->getRoles());
Code in HelperAbstract.php file:

public function setAcl(Zend_Acl $acl = null)
{
    $this->_acl = $acl;
    return $this;
}

[requinix]

That "acl" in the Zend_Registry doesn't exist. Or doesn't yet exist when that code is running.

Obligatory comment that PHP 5.4 is ridiculously old and that if you're working on something new (which I suspect is not the case) then you must upgrade. Oh wait you have a thread for that.