connecting postgres with laravel

Hello i'm trying to connect laravel 5.4 with postgres, after updating the database configuration file and running php artisan migrate, the following error appears:

[Illuminate\Database\QueryException]
 could not find driver (SQL: select * from information_schema.tables where t
 able_schema = public and table_name = migrations)
[PDOException]
 could not find driver

this is my .env file

DB_CONNECTION=pgsql
DB_HOST=127.0.0.1
DB_PORT=5432
DB_DATABASE=Portail
DB_USERNAME=php
DB_PASSWORD=php

and this is my database.php file

'default' => env('DB_CONNECTION', 'pgsql'),
 'pgsql' => [
            'driver' => 'pgsql',
            'host' => env('DB_HOST', '127.0.0.1'),
            'port' => env('DB_PORT', '5432'),
            'database' => env('DB_DATABASE', 'Portail'),
            'username' => env('DB_USERNAME', 'php'),
            'password' => env('DB_PASSWORD', 'php'),
            'charset' => 'utf8',
            'prefix' => '',
            'schema' => 'public',
            'sslmode' => 'prefer', ], 

and i use phpPgAdmin normally

via Chebli Mohamed