Socialengine erreur : exception 'Zend_Controller_Dispatcher

Bonjour
J'utilise social engine 4.5 mais je ne peux pas installer de module
J'ai ce message d'erreur dans les fichiers log :

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2013-09-22T01:28:02+00:00 CRIT (2): exception 'Zend_Controller_Dispatcher_Exception' with message 'Invalid controller specified (externals)' in /var/www/vhosts/mysite/httpdocs/application/libraries/Zend/Controller/Dispatcher/Standard.php:242
Stack trace:
#0 /var/www/vhosts/mysite/httpdocs/application/libraries/Zend/Controller/Front.php(946): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#1 /var/www/vhosts/mysite/httpdocs/application/libraries/Zend/Application/Bootstrap/Bootstrap.php(77): Zend_Controller_Front->dispatch()
#2 /var/www/vhosts/mysite/httpdocs/application/libraries/Zend/Application.php(358): Zend_Application_Bootstrap_Bootstrap->run()
#3 /var/www/vhosts/mysite/httpdocs/install/index.php(87): Zend_Application->run()
#4 {main}

Standard.php line :

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/**
         * Get controller class
         */
        if (!$this->isDispatchable($request)) {
            $controller = $request->getControllerName();
            if (!$this->getParam('useDefaultControllerAlways') && !empty($controller)) {
                // require_once 'Zend/Controller/Dispatcher/Exception.php';
                throw new Zend_Controller_Dispatcher_Exception('Invalid controller specified (' . $request->getControllerName() . ')');
            }
 
            $className = $this->getDefaultControllerClass($request);
        } else {
            $className = $this->getControllerClass($request);
            if (!$className) {
                $className = $this->getDefaultControllerClass($request);
            }
        }

Application.php line :

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public function run()
    {
        $this->getBootstrap()->run();
    }

Bootstrap.php line :

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 public function run()
    {
        $front   = $this->getResource('FrontController');
        $default = $front->getDefaultModule();
        if (null === $front->getControllerDirectory($default)) {
            throw new Zend_Application_Bootstrap_Exception(
                'No default controller directory registered with front controller'
            );
        }
 
        $front->setParam('bootstrap', $this);
        $front->dispatch();
    }
}

Front.php line :

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try {
                    $dispatcher->dispatch($this->_request, $this->_response);
                } catch (Exception $e) {
                    if ($this->throwExceptions()) {
                        throw $e;
                    }
                    $this->_response->setException($e);
                }

Index.php line :

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// Run
try {
  $application->bootstrap();
  $application->run();
} catch( Exception $e ) {

Vous pouvez m'aider ?
Merci

Socialengine erreur : exception 'Zend_Controller_Dispatcher_Exception'