pdo_oci_handle_factory: Error while trying to retrieve text for error ORA-01804

I'm using Laravel 5.5, php 7.1.9, and oracle 10g

i don't know if i'm connected to the database or not and if yes, is the problem in my code ?

PDOException SQLSTATE[HY000]: pdo_oci_handle_factory: Error while trying to retrieve text for error ORA-01804 (ext\pdo_oci\oci_driver.c:640)

oracledb.php

return [
    'oracle' => [
        'driver'    => 'pdo',
        'tns'       => env('DB_TNS', 'XE'),
        'host'      => env('DB_HOST', 'GREEN-PC'),
        'port'      => env('DB_PORT', '1521'),
        'database'  => env('DB_DATABASE', 'XE'),
        'username'  => env('DB_USERNAME', 'esprit'),
        'password'  => env('DB_PASSWORD', 'esprit'),
        'charset'   => '',
        'prefix'    => '',
        'quoting'   => false,
    ],
];

in my controller

public function show()
{
    $res =  DB::table('esp_etudiant')
        ->where('id_et','1630242')
    ->get();
    print_r($res);
}

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