php - Opencart frond-end works well but admin returns blank page -

i confused opencart website, migrated website ftp server localhost using mamp couldn't work since /admin returns me black page. have checked 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 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 pretty sure 2 config.php right configured, if not right, php log return me errors assume.

so there can give me hint notice means? , how /admin works well. thank 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',   ), ) 

finally solved problem, seems due cookie , session problems.