OpenContract works well, but admin returns blank page

I am confused about my opencart website since I migrated my website from ftp server to my localhost using MAMP. I couldn't get it to work as / admin only returns a black page for me. I checked my PHP logs:

[23-Jul-2015 12:48:16 Europe/Paris] PHP Notice:  Undefined index:  in /Applications/MAMP/htdocs/uta/admin/index.php on line 151
[23-Jul-2015 12:48:16 Europe/Paris] PHP Notice:  Undefined index:  in /Applications/MAMP/htdocs/uta/admin/index.php on line 152
[23-Jul-2015 12:48:16 Europe/Paris] PHP Notice:  Undefined index:  in /Applications/MAMP/htdocs/uta/admin/index.php on line 156
[23-Jul-2015 12:48:16 Europe/Paris] PHP Notice:  Undefined index:  in /Applications/MAMP/htdocs/uta/admin/index.php on line 157
[23-Jul-2015 12:48:16 Europe/Paris] PHP Notice:  Undefined index:  in /Applications/MAMP/htdocs/uta/system/library/Translation.php on line 371
[23-Jul-2015 12:48:16 Europe/Paris] PHP Notice:  Undefined index:  in /Applications/MAMP/htdocs/uta/system/library/Translation.php on line 371
[23-Jul-2015 12:48:16 Europe/Paris] PHP Notice:  Undefined index:  in /Applications/MAMP/htdocs/uta/system/library/Translation.php on line 371
[23-Jul-2015 12:48:16 Europe/Paris] PHP Notice:  Undefined index:  in /Applications/MAMP/htdocs/uta/system/library/Translation.php on line 371

      

        
        
        
      

    

Here is my admin / index.php:

 $config->set('config_language_id', $languages[$code]['language_id']);
 $config->set('config_admin_language', $languages[$code]['code']);
 $config->set('config_language_default', $languages['fr']['language_id']);

    // Language
 $language = new Language($languages[$config->get('config_admin_language')]     ['directory']);
 $language->load($languages[$config->get('config_admin_language')]['filename']);
 $registry->set('language', $language);

      

        
        
        
      

    

And Translation.php:

  private function loadFile($language_id, $filename)

{

    $code = $this->languages[$language_id]['code'];

    $file = $this->lang_root . $code . '/' . $filename . $this->file_ext;

    if (file_exists($file)) {

        $_lang = array();

        include $file;

        $this->translations[$filename][$language_id] = $_lang;

    } else {

        $this->translations[$filename][$language_id] = array();

    }



}

      

        
        
        
      

    

While I'm pretty sure my 2 config.php is set up correctly, if it's wrong php log will give me back some errors that I'm guessing.

So is there anyone who can give me a hint on what this notification means? And how to get / admin works well. Thank you in advance.

error_log (var_export ($ languages, true)) shows me:

array (
  'en' => 
  array (
    'language_id' => '1',
    'name' => 'English',
    'code' => 'en',
    'locale' => 'en_US.UTF-8,en_US,en-gb,english',
    'image' => 'gb.png',
    'directory' => 'english',
    'filename' => 'startup',
    'sort_order' => '1',
    'status' => '1',
  ),
  'fr' => 
  array (
    'language_id' => '2',
    'name' => 'Français',
    'code' => 'fr',
    'locale' => 'fr_CA.UTF-8,fr_FR.UTF-8,fr_CA,fr_FR,fr-fr,french',
    'image' => 'fr.png',
    'directory' => 'french',
    'filename' => 'startup',
    'sort_order' => '0',
    'status' => '1',
  ),
  'ru' => 
  array (
    'language_id' => '3',
    'name' => 'Russian',
    'code' => 'ru',
    'locale' => 'ru,ru_RU,ru_RU.UTF-8',
    'image' => 'ru.png',
    'directory' => 'russian',
    'filename' => 'startup',
    'sort_order' => '2',
    'status' => '1',
  ),
)

      

        
        
        
      

    

error_log (var_export ($ this-> languages, true)) shows me:

array (
  1 => 
  array (
    'code' => 'en',
    'name' => 'English',
    'img' => 'gb.png',
    'id' => '1',
  ),
  2 => 
  array (
    'code' => 'fr',
    'name' => 'Français',
    'img' => 'fr.png',
    'id' => '2',
  ),
  3 => 
  array (
    'code' => 'ru',
    'name' => 'Russian',
    'img' => 'ru.png',
    'id' => '3',
  ),
)