Drupal 8 PostgreSQL problem

Hello,

I am not able to install the Drupal 8.0.2 on the PostgreSQL 9.2.4.
Could you please help me in this issue? The details you can find below.
Thank you in advance.

Additional uncaught exception thrown while handling exception.
Original

Drupal\Core\Database\DatabaseExceptionWrapper: SQLSTATE[42P07]: Duplicate table: 7 ERROR: relation "cache_discovery" already exists: CREATE TABLE {cache_discovery} ( "cid" varchar(255) NOT NULL default '', "data" bytea NULL, "expire" int NOT NULL default 0, "created" numeric(14, 3) NOT NULL default 0, "serialized" smallint NOT NULL default 0, "tags" text NULL, "checksum" varchar(255) NOT NULL, CONSTRAINT cache_discovery____pkey PRIMARY KEY ("cid") ); Array ( ) in Drupal\Core\Plugin\DefaultPluginManager->cacheSet() (line 76 of /www/xxx_ftp/www/xxx.com/core/lib/Drupal/Core/Cache/UseCacheBackendTrait.php).

Drupal\Core\Plugin\DefaultPluginManager->cacheSet('entity_type', Array, -1, Array)
Drupal\Core\Plugin\DefaultPluginManager->setCachedDefinitions(Array)
Drupal\Core\Plugin\DefaultPluginManager->getDefinitions()
Drupal\Core\Entity\EntityManager->getDefinitions()
Drupal\Core\Config\ConfigManager->getEntityTypeIdByName('core.extension')
Drupal\Core\Config\ConfigInstaller->createConfiguration('', Array)
Drupal\Core\Config\ConfigInstaller->installDefaultConfig('core', 'core')
Drupal\Core\ProxyClass\Config\ConfigInstaller->installDefaultConfig('core', 'core')
drupal_install_system(Array)
install_base_system(Array)
install_run_task(Array, Array)
install_run_tasks(Array)
install_drupal(Object)

Additional

Drupal\Core\Database\DatabaseExceptionWrapper: SQLSTATE[42P01]: Undefined table: 7 ERROR: relation "key_value" does not exist LINE 3: key_value key_value ^: SELECT 1 AS expression FROM {key_value} key_value WHERE ( (name = :db_condition_placeholder_0) AND (collection = :db_condition_placeholder_1) ); Array ( [:db_condition_placeholder_0] => system.theme.files [:db_condition_placeholder_1] => state ) in Drupal\Core\State\State->set() (line 89 of /www/xxx_ftp/www/xxx.com/core/lib/Drupal/Core/State/State.php).

Drupal\Core\State\State->set('system.theme.files', Array)
Drupal\Core\Extension\ThemeHandler->rebuildThemeData()
Drupal\Core\Extension\ThemeHandler->refreshInfo()
Drupal\Core\Extension\ThemeHandler->listInfo()
_drupal_maintenance_theme()
drupal_maintenance_theme()
install_display_output(Array, Array, Array)
_drupal_log_error(Array, 1)
_drupal_exception_handler(Object)