Update dotenv env file

backend/config/environments/development.php

@@ -8,6 +8,7 @@ define('SCRIPT_DEBUG', true);
  * Use Dotenv to set required environment variables and load .local.env file
  */
 
+if (class_exists(\Dotenv\Dotenv::class)) {
 	$dotenv_dir = dirname(dirname(dirname(__DIR__)));
 
 	$env_file_name = null;
@@ -23,3 +24,4 @@ if (isset($env_file_name)) {
 		$dotenv->load();
 		$dotenv->required(['MYSQL_DATABASE', 'MYSQL_USER', 'MYSQL_PASSWORD']);
 	}
+}