Upgrading to 5.6.0.2 / Another problem

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Hi everybody,
I meet troubles with upgrade (french) from 5.5.2.1_fr_FR to 5.6.0.2
I think, the problem is the theme but ..
First
after this message
Fatal error: Call to undefined method CountableArea::isMasterCollection() in /home/client/www/domaine/updates/concrete5.6.0.1/concrete/core/models/permission/response/page.php on line 70


I comment :

[/code]
Loader::model('countable_area', 'theme_sue');
$header = new CountableArea('Header');
But I have a new error
[code]
Fatal error: Call to a member function getTotalBlocksInArea() on a non-object in /home/client/www/domaine/packages/theme_sue/themes/sue/elements/header.php on line 137


then I comment
elseif ($header->getTotalBlocksInArea($c) > 0 ) :


Everything seems ok for users, but when I want to edit a page I can read :
Fatal error: Call to a member function display() on a non-object in /home/client/www/domaine/packages/theme_sue/themes/sue/elements/header_area.php on line 4


In this page > header_area.php
I have .. only..
<?php  defined('C5_EXECUTE') or die(_("Access Denied.")) ?> 
      <div class="row"> 
         <div id="header" class="col_12"> 
                            <?php $header->display($c) ?> 
                        </div> 
                </div>


But I don't know what can I have to do !!
Someone can help me ?

Thank you

Elstud