Warning: Unsupported declare 'strict_types' in D:\xampp\htdocs\flutter_api\vendor\kreait\firebase-php\src\Firebase\Exception\Auth\PhoneNumberExists.php on line 3

Fatal error: Interface 'Kreait\Firebase\Exception\AuthException' not found in D:\xampp\htdocs\flutter_api\vendor\kreait\firebase-php\src\Firebase\Exception\Auth\PhoneNumberExists.php on line 12