element in default.ctp calls helper -> Undefined property: View::$Menu1 (only on production server)

hi

i get Undefined property: View::$Menu1 ONLY on my production server.
on localhost no error message.
i use the same cakephp version 2.1.3 on both.
php 5.3.10 on localhost and php 5.3.2 on production server.

default.ctp:
<?php echo $this->element('header'); ?>

in View/Elements/header.ctp:
<div class="<?php echo $this->Menu1->myhighlight('/pages/home$'); ?>">

in View/Helper/Menu1Helper.php:

App::uses('AppHelper', 'View/Helper');
class Menu1Helper extends AppHelper {
    public $helpers = array('Html');
    public function myhighlight($path, $normal = 'navLink', $selected = 'current_page_item') {
       .....
        return $class;
    }
}

in AppController.php:
public $helpers = array('Form', 'Html', 'Session', 'Menu1');

any help very welcome, i'm  stuck.
regards

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